Mercimek corbasi is the soup Turkey runs on: red lentils cooked with onion, carrot, and potato until everything collapses, blended into a smooth golden puree, and finished with butter sizzled with dried mint and red pepper flakes. A squeeze of lemon at the table cuts through it. It is on the menu of every lokanta in the country, served before almost every meal, and it costs practically nothing to make.
The Everyday Soup
Lentils have been a food source in Anatolia since Neolithic times, and mercimek corbasi is the most direct expression of that long history. In Turkey it is not a special dish but a daily one, ladled out in workplace canteens, ordered as a first course in restaurants, and made at home in large pots that last several days. During Ramadan it opens the iftar table almost universally, since a bowl of hot soup is the gentle way to break a fast. Every household makes it slightly differently, but the core is fixed: red lentils, a few vegetables, and a mint butter finish.
Red Lentils
Split red lentils are what this soup requires, and they behave unlike any other pulse. They need no soaking, cook in about twenty minutes, and then break down completely into a thick puree rather than holding their shape, which is exactly what the recipe wants. Rinse them in several changes of water until it runs clear, since the starch and dust that come off otherwise cloud the soup and make it foam heavily. Brown or green lentils will not work here; they stay intact and give a completely different dish.
The Vegetable Base
Onion, carrot, and potato go in alongside the lentils, and each one does a job. The onion gives sweetness, the carrot deepens the color and adds a faint sweetness of its own, and the potato contributes body so the finished soup has weight without needing cream or flour. Cook them briefly in butter first to soften them, then add tomato paste and let it fry for a minute, which removes its metallic raw taste and builds a deeper base. Some cooks add a spoonful of biber salcasi, the Turkish red pepper paste, alongside the tomato paste for extra depth.
Blending Smooth
Turkish lentil soup is velvety, and getting there matters more than any other step. Once the lentils have disintegrated and the vegetables are soft enough to crush against the side of the pot, blend everything until completely smooth, with no lumps or fibrous pieces left. An immersion blender in the pot is the easiest route; a countertop blender gives an even finer result if you work in batches and take care with the hot liquid. Then thin it with hot water until it pours easily, since it thickens noticeably as it sits and again as it cools.
The Mint Butter
What makes this soup unmistakably Turkish is the drizzle poured over at the end. Melt butter until it foams, take the pan off the heat, and stir in dried mint and pul biber, the Aleppo-style red pepper flakes, letting the residual warmth release their aroma into the fat. Off the heat is the important part: dried mint scorches within seconds over direct flame and turns the whole thing bitter. Spoon the red-flecked butter over each bowl at the table so it sits on the surface. Dried mint is specified rather than fresh, since the two taste nothing alike here.
Serving Mercimek Corbasi
Serve it hot with wedges of lemon, which are not decoration: squeezing lemon into the bowl is standard practice across Turkey and the acidity lifts the whole soup. Bread comes alongside, ideally a fresh loaf or pide bread for dipping. It works as a starter before a larger meal or as a light supper on its own with bread and cheese. It keeps four or five days refrigerated and freezes well, thickening in the fridge, so loosen it with hot water when reheating and add fresh mint butter to each bowl rather than storing it mixed in.
Common Questions
Do I need to soak red lentils?
No. Red lentils cook in about twenty minutes without soaking and break down on their own. Rinsing them well until the water runs clear is worth doing, since it reduces foaming and gives a cleaner-tasting, less cloudy soup.
Can I make it vegan?
Yes. Use olive oil in place of butter both for the vegetables and for the mint drizzle, and cook the lentils in water or vegetable stock. The soup is otherwise entirely plant-based and loses very little in the substitution.
Why is my mint drizzle bitter?
The mint burned. Melt the butter first, then take the pan completely off the heat before stirring in the dried mint and pepper flakes. The residual warmth is enough to release their flavor without scorching them.
Mercimek corbasi is Turkey's red lentil soup, served in homes and lokantas across the country, finished with dried mint sizzled in butter and a squeeze of lemon at the table.