Daniel sent us this one — he wants to talk about lentils. How many types are there, how long have humans been eating them, and what's the deal with split red lentils — are they a processed food or just a different variant? He also wants a nutritional comparison between green and red lentils and a tour of how lentils show up in cuisines around the world. Honestly, lentils might be the most under-discussed staple food on the planet.
They absolutely are. Ten thousand years of continuous cultivation and most people couldn't name more than two varieties. That's like knowing Beethoven exists but only ever hearing the first four notes of the Fifth Symphony.
The four-note lentil. Brown and red, end of list.
Which is wild because lentils are one of the foundational crops of human civilization. We have carbonized lentil seeds from Tell Abu Hureyra in Syria — that's a site excavated in the early seventies — dating to around 8500 BCE. These were wild lentils being gathered and then domesticated right alongside einkorn wheat and barley. Lentils are literally a founding member of the agricultural revolution.
Humans were eating lentils before we invented pottery, before we invented the wheel, before we invented writing. Lentils predate the concept of a recipe by about nine thousand years.
They were doing it at Çatalhöyük in Turkey too — that's another major Neolithic site with lentil remains. By 4000 BCE lentils had spread to the Indus Valley. They show up in Egyptian tombs from 2400 BCE. Theophrastus mentions them in ancient Greece. Columella writes about growing them in Roman agriculture. This is not a niche food that got popular recently. This is a crop that built civilizations.
Let's pin down what we're actually talking about botanically. What is a lentil, taxonomically speaking?
Lens culinaris, in the Fabaceae family — the legumes. They're distinct from beans and peas in a few ways. They're lens-shaped, obviously — that's where the optical lens gets its name, by the way, from the Latin word for lentil — and they're much smaller than most beans, they cook faster, and they have a different protein and carbohydrate profile. The plant itself is a short annual bush, maybe forty centimeters tall, and the seeds grow in small pods, typically one or two seeds per pod.
The optical lens is named after a lentil. That's the kind of etymological fact that feels made up but isn't.
It's completely true. And it tells you something about how central lentils were to the ancient Mediterranean world — they were the default small round object.
How many types are we actually talking about in global commerce?
The major market classes break down into brown, green, red, yellow, black — those are sometimes called Beluga lentils because they look like caviar — and French green lentils, which are Puy lentils specifically from the Le Puy region, though the term gets used loosely for other small green varieties. Then you've got regional specialties. Spanish Pardina lentils, which are small brown ones with a slightly nutty flavor. Italian Castelluccio lentils from Umbria. There are dozens of cultivars, but in a typical supermarket you're probably seeing brown, green, red, and maybe black if it's a fancy store.
The one Daniel was particularly curious about is split red lentils, because they don't look like whole lentils. They're bright orange, they're flat, they dissolve into mush when you cook them. They seem almost like a different product entirely.
This is where the processing question gets interesting. A whole red lentil — and this surprises people — is not red on the outside. It's a brownish-grey seed with a red cotyledon inside. The red part is the interior. So what happens in processing is the seed gets harvested, dried, and then run through an abrasive mill that removes the hull — the seed coat. Then it goes through a roller mill that cracks the cotyledon along its natural seam. That's it. It's mechanical. No chemicals, no additives, no heat treatment beyond drying. You're just removing the outer jacket and splitting the inner seed.
It's closer to rolling oats than to making Cheetos.
That's exactly the right comparison. Rolled oats are steamed and flattened whole oat groats. Split red lentils are dehulled and split lentil seeds. By FDA classification standards, both are minimally processed agricultural products. The hull that gets removed doesn't go to waste either — it typically becomes animal feed or compost. Nothing in the process is synthetic.
This is the thing that drives me crazy about the "processed food" discourse. People hear "processed" and lump together mechanically separated chicken paste with a lentil that got its jacket removed.
There's a genuine functional reason for the processing. The seed coat — the hull — is a water barrier. It's tough, it's fibrous, and it slows down water absorption significantly. Whole red lentils take about twenty-five to thirty minutes to cook. Split red lentils take ten to fifteen minutes. In a lot of cuisines where lentils are a daily staple, that time difference matters enormously. If you're cooking dal every single day, cutting the cooking time in half is a real quality-of-life improvement.
In hot climates, less time over a fire or a stove means less fuel, less heat in the house. The processing has practical roots, not just industrial ones.
And the dehulling and splitting process has been done for thousands of years — it wasn't invented in a factory. Traditional methods used stone mills and hand pounding. The industrial version in places like Saskatchewan, which by the way produces about sixty percent of the world's lentils, is just scaling up a very old technique.
Canada produces sixty percent of the world's lentils?
Saskatchewan is lentil country. The climate and soil are ideal — cool nights, hot days, well-drained soil. India is the largest producer and consumer at about twenty-five percent of global production, but Canada is the export powerhouse. If you're eating lentils in Europe or the Middle East, there's a good chance they came from Saskatchewan.
That's a sentence I never expected to say. Saskatchewan, the lentil breadbasket of the world.
They even have a Lentil Commission. It's a whole thing.
Of course there is. So we've established that humans have been eating lentils for over ten thousand years, and that split red lentils are mechanically processed but not in any way that should scare you. Now the obvious question is: does removing the hull actually change what you're getting nutritionally?
It does, and the difference is mostly about fiber. Let me give you the head-to-head numbers per one hundred grams cooked. Green lentils — whole, with the hull — have about eight point eight grams of protein, seven point nine grams of fiber, and twenty grams of carbohydrates. Split red lentils have about nine grams of protein, three point nine grams of fiber, and twenty grams of carbs. The protein and carbs are nearly identical. The fiber is cut roughly in half.
You're losing about four grams of fiber per serving. That's not nothing, but it's also not a reason to panic.
It's specifically the insoluble fiber you're losing — the roughage that's in the hull. Insoluble fiber is what helps with digestion and satiety, it's the stuff that keeps things moving. The soluble fiber, which is in the cotyledon itself and helps with cholesterol and blood sugar, is still there. So you're not losing all the fiber benefits, just a specific category.
What about micronutrients?
Per cup cooked, red lentils have about a hundred and eighty micrograms of folate versus a hundred and eighty-one for green lentils — basically identical. Iron is three point three milligrams in red versus three point zero in green. Red lentils actually edge out green slightly on iron and potassium. Green lentils have more calcium and vitamin K. The differences are small enough that you'd never choose one over the other on micronutrients alone.
The glycemic index? I'd expect split lentils to spike blood sugar faster since they cook down softer and don't have the hull slowing digestion.
You'd expect that, and it's true — but the difference is smaller than you might think. Whole green lentils have a glycemic index around thirty, which is solidly low. Split red lentils are around thirty-six. For context, white bread is around seventy-five, white rice around seventy-three. So even the "fast" lentil is slow by any reasonable standard. The protein and fiber content of the cotyledon itself does a lot of the blood sugar buffering work.
The nutritional takeaway is: split lentils lose about half the fiber but retain virtually all the protein and micronutrients, and they're still a low glycemic index food. Not a nutritional catastrophe by any stretch.
Not even close to a catastrophe. The real question is what you're trying to do with them. If you're making a salad where you want distinct, chewy lentils that hold their shape, you want whole green or brown or black lentils. If you're making a dal or a soup where you want the lentils to break down into a creamy texture, you want split red or yellow. The "best" lentil is entirely contextual.
Which is the perfect segue into the cultural piece, because different cuisines figured this out centuries ago and built entire food traditions around specific lentil types. Let's take a culinary tour.
Start with India, because India is arguably the global center of lentil culture. Masoor dal — that's split red lentils — is a daily staple across much of the subcontinent. It's typically cooked with turmeric, then tempered with ghee, cumin seeds, garlic, and dried red chilies. The tempering — the tadka — is poured over the cooked dal at the end, and it transforms this humble lentil mush into something fragrant and complex.
It's eaten with rice or roti basically every day. It's not a special occasion food, it's the backbone of the meal.
And then you've got toor dal, which is split pigeon peas, not lentils — but it's part of the same dal universe. You've got sambar in South India, which uses toor dal as the base with tamarind and vegetables. You've got rasam, which is a thinner, spicier lentil broth. The variety within Indian lentil cooking alone could fill a book. Several books, actually.
Move west to the Middle East.
This is one of the great comfort foods of the Levant — lentils and rice cooked together, topped with an absolutely absurd amount of caramelized onions. Sometimes bulgur instead of rice. The lentils are usually brown or green so they hold their shape. It's simple, it's cheap, and it's deeply satisfying. There's a saying that mujadara is the food of the poor, but everyone eats it because it's delicious.
It's also one of those dishes where the sum is dramatically greater than the parts. Lentils, rice, onions, oil, salt. That's five ingredients, and it tastes like someone worked all day.
Then in Egypt you've got koshari, which is a whole other level. Rice, lentils, macaroni, chickpeas, fried onions, and a spiced tomato sauce with garlic and vinegar. It's a street food, it's a national dish, and it's basically a carbohydrate symphony. The lentils in koshari are usually brown, again for texture.
The philharmonic of starch.
I stand by it. Moving to Ethiopia — misir wot. This is a spiced red lentil stew made with berbere spice blend and clarified butter, slow-cooked until thick and deeply flavored. It's served on injera, the spongy fermented flatbread. Split red lentils work perfectly here because they break down into the stew consistency you want.
Ethiopia has a whole fasting tradition where animal products are off the table for large portions of the year, so lentils and other legumes become the protein backbone of the diet.
Legumes are doing the heavy lifting nutritionally during those fasting periods. Now jump to Europe. In Italy, lentils are traditionally eaten on New Year's Eve — the little round lentils are supposed to resemble coins, so eating them brings prosperity. Usually it's a simple lentil soup with the small brown Castelluccio lentils, often served with cotechino sausage.
Coin-shaped prosperity legumes. I love a good food superstition with actual staying power.
In France, Puy lentils from the Auvergne region are the star. They're small, dark green with blue marbling, and they hold their shape exceptionally well. The classic preparation is a lentil salad with a sharp vinaigrette, maybe some shallots, maybe some goat cheese. They're also the lentil you'll find under a piece of salmon at a French bistro. Puy lentils have an AOC designation — Appellation d'Origine Contrôlée — which is the same protected status given to wines and cheeses.
A lentil with an AOC. That's how you know it's serious.
Spain has Pardina lentils, which are small and brown and hold their shape well in soups and stews. They're the lentil of Spanish lentil soup, often cooked with chorizo and morcilla. And then across the Mediterranean you see lentils showing up in endless variations — Greek fakes soup with oregano and vinegar, Turkish mercimek çorbası which is a smooth red lentil soup often served with lemon and paprika butter.
Mercimek çorbası is one of those soups that tastes like it should be complicated and isn't. Red lentils, onion, carrot, stock, cumin, paprika. It's the efficiency of dal applied to a completely different flavor palette.
That's the thing that strikes me about lentils globally — the same handful of varieties get adapted into radically different flavor worlds using whatever spices and fats are local. A red lentil in India meets ghee, cumin, and turmeric. The same red lentil in Turkey meets olive oil, paprika, and lemon. In Ethiopia it meets berbere and niter kibbeh. The lentil is the canvas, not the painting.
The lentil is the canvas. That's good. So let's zoom out to the nutritional powerhouse argument, because Daniel specifically asked about that. What makes lentils special compared to other plant proteins?
A few things. First, protein content. Among legumes, lentils have the second-highest protein content after soybeans. Per one hundred grams cooked, you're getting about nine grams of protein. That's substantial for a plant food. Second, when you pair lentils with grains — rice, wheat, corn — you get a complete protein. Lentils are high in lysine, which grains are low in. Grains are high in methionine, which lentils are low in. Together, they cover all the essential amino acids. This isn't a new discovery — cultures figured this out empirically thousands of years ago. Rice and dal. Beans and corn tortillas in the Americas. It's the same pattern everywhere.
The classic vegetarian anxiety about "complete proteins" is mostly solved by eating lentils with basically any grain, which is what almost every traditional cuisine does anyway.
You don't need to combine them in the same meal either — your body pools amino acids over the course of a day. But the traditional pairings are delicious, so why not? Third, the environmental angle. There was a 2018 study in Science that found lentils have a carbon footprint forty-three times lower than beef per gram of protein. Forty-three times. That's not a rounding error, that's an order-of-magnitude difference.
The 2019 EAT-Lancet Commission report identified lentils as a key protein source for sustainable diets. So this isn't fringe environmentalism — it's the mainstream scientific consensus on how to feed ten billion people without cooking the planet.
Lentils are also nitrogen fixers. They pull nitrogen from the air and fix it in the soil, which means they require less synthetic fertilizer than crops like wheat or corn. They improve soil health for whatever crop comes next in the rotation. They're drought-tolerant compared to many other legumes. They store for years without refrigeration. They cook fast without soaking. They're cheap — roughly a dollar fifty per pound dry in bulk. That works out to about thirteen grams of protein per dollar. Compare that to chicken at roughly four grams of protein per dollar or beef at about two grams per dollar.
On a protein-per-dollar basis, lentils are roughly three times better than chicken and six times better than beef. And that's before you factor in the fiber, the folate, the iron, the magnesium, the potassium, the fact that they don't need refrigeration, and the fact that they've been feeding civilizations for ten millennia.
When you lay it all out like that, the question isn't "why would you eat lentils." It's "why wouldn't you eat lentils more often.
Yet, lentils have an image problem. They're the food of austerity, of peasant cooking, of "I'm eating this because I have to, not because I want to.
Which is deeply unfair, because lentils are also the food of some of the most delicious things humans have ever invented. Mujadara with those deeply caramelized onions is not austerity food. A properly tempered dal with fresh cumin and garlic is not austerity food. Misir wot with berbere and injera is not austerity food. The austerity association is mostly a Western thing — in the cultures that cook lentils best, they're celebrated.
It's the lentil equivalent of "rice is boring." No, your rice is boring. Go to a place where rice is the center of the cuisine and it's transcendent.
So let me address the misconception directly: lentils do not need to be soaked before cooking. Unlike dried beans, which benefit from an overnight soak to reduce cooking time and improve digestibility, lentils are small enough and thin-skinned enough that they cook perfectly well from dry. Green and brown lentils take about twenty-five to thirty minutes. Split red lentils take ten to fifteen minutes. Black Beluga lentils take about twenty-five minutes and hold their shape beautifully. Puy lentils take about twenty to twenty-five minutes. These are weeknight-friendly cooking times.
The soaking misconception probably comes from people conflating lentils with beans. They're both legumes, so people assume the same rules apply.
It's a shame because it makes lentils seem like more work than they are. You can decide at five thirty that you want dal for dinner and have it on the table by six.
Let's pull this all together into something actionable. If someone's standing in the grocery aisle looking at bags of lentils, what should guide their choice?
It depends entirely on what you're cooking. If you want a lentil that holds its shape — for salads, for side dishes, for mujadara, for anything where you want distinct lentils rather than a puree — go with whole lentils. Brown, green, black Beluga, or Puy if you can find them. Brown lentils are the workhorse, the cheapest and most widely available. Green lentils have a slightly peppery flavor and hold their shape even better. Black Beluga lentils are the most visually striking and have a rich, earthy flavor. Puy lentils are the premium option with that mineral, almost peppery taste from the volcanic soil they grow in.
If you want lentils that break down into a creamy texture?
Split red or split yellow lentils. These are your dal lentils, your soup lentils, your lentil puree lentils. They cook the fastest and they basically dissolve into the dish. Red and yellow are mostly interchangeable, though red is more common in most markets. Don't buy whole red lentils unless you specifically want to — they exist but they're harder to find and they defeat the purpose of what makes red lentils useful.
If you've only ever cooked brown lentils, the actionable advice is: try one new variety this week. Pick up some split red lentils and make a simple dal. Or grab some green lentils and make a lentil salad with vinaigrette and herbs. The different varieties genuinely behave differently in the kitchen.
The other thing I'd say is: don't be afraid of split lentils because they're "processed." As we've established, they're mechanically hulled and split. That's it. No chemicals, no additives, no refining. You're losing about half the fiber, which matters, but you're keeping everything else. If the faster cooking time and creamier texture make you more likely to actually cook and eat lentils, that's a net win. The healthiest lentil is the one you actually eat.
That's the nutrition advice that applies to basically everything. The healthiest version is the one that makes it onto your plate regularly.
Lentils make that easy because they're cheap, they're shelf-stable, and they're fast. A bag of lentils in the pantry is dinner insurance. Even if you haven't been to the store in a week, you've got lentils, you've probably got an onion, you've got some spices, and you can make something good in half an hour.
The lentil as a financial instrument.
A delicious financial instrument with nine grams of protein per serving.
We've traveled from ancient Syria to modern Saskatchewan, from dal to mujadara to misir wot, and the conclusion seems to be that lentils are simultaneously one of the oldest foods on earth and one of the most relevant to where we are right now — plant-based eating, food security, climate-conscious agriculture. Let's look forward a bit. Lentil consumption is projected to grow about fifteen percent by 2030 as plant-based diets expand. But climate change is threatening pulse crops. What needs to happen to keep lentils resilient?
This is an active area of breeding research. Lentils are relatively drought-tolerant compared to other legumes, but they're not invincible. Heat stress during flowering can reduce yields significantly. Researchers are working on breeding heat-tolerant varieties, and there's work on disease resistance too — lentils are susceptible to fungal diseases like ascochyta blight and fusarium wilt. The good news is that lentils have a lot of genetic diversity to draw on. The wild relatives of Lens culinaris still exist across the Middle East and Mediterranean, and those wild populations contain traits that cultivated varieties might need.
The genetic library that could save the lentil is still out there, in the same region where humans first domesticated it ten thousand years ago.
Which is a neat full-circle story. And there's also work on improving the processing side — finding ways to dehull and split lentils that preserve more of the nutritional value of the hull, or breeding varieties with thinner hulls that don't need to be removed in the first place. The split lentil of the future might look different from the split lentil of today.
The lentil innovation pipeline. Another phrase I never expected to utter.
Lentils are going to be a bigger part of the global food system, not a smaller one. Getting the breeding, the agronomy, and the processing right is how we make sure they stay cheap, nutritious, and available.
To wrap this up — Daniel asked a bunch of specific questions and I think we've covered them. There are dozens of lentil varieties across six major market classes. Humans have been eating them since 8500 BCE. Split red lentils are mechanically dehulled and split, not chemically processed — they lose about half the fiber but keep the protein and micronutrients. Green and red lentils are nutritionally similar except for the fiber gap. And lentils show up in virtually every cuisine on earth, from Indian dal to Lebanese mujadara to Ethiopian misir wot to Italian New Year's soup.
They're a nutritional powerhouse — second-highest protein among legumes, complete protein when paired with grains, forty-three times lower carbon footprint than beef, and about thirteen grams of protein per dollar. Not bad for a tiny lens-shaped seed.
Not bad at all.
Now: Hilbert's daily fun fact.
Hilbert: In 1923, French physicist Jules Richard unveiled a stereoscopic rangefinder in Bamako, French Sudan, to assist in mapping the Niger River's inland delta — and the device was so precise for its era that colonial surveyors nicknamed it "l'oeil de Paris," the eye of Paris, despite it never having been anywhere near the city.
The eye of Paris, deployed in Mali to map a river delta.
If you enjoyed this deep dive into lentils — and honestly, how could you not — rate the show and share it with a friend who still thinks lentils are just brown mush in a bulk bin.
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