Why it works: Lentils and onion match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and cooks put them together in 1,221 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Stewed Lentils
Ingredients
Directions
Prepare the lentils
Wash the lentils in cold water and soak them for 4 hours or overnight.
Drain the lentils.
Place the lentils in a saucepan, cover with cold water, and add salt.
Bring the lentils to a boil, then reduce heat and simmer uncovered for 1 hour.
Make the onion
Peel and slice the onion.
In another saucepan, melt the butter.
Add the sliced onion to the butter and fry until golden, stirring occasionally.
Combine and serve
Once the lentils are cooked, combine them with the onion.
Add the stock to the lentils and onion mixture.
Season with pepper and salt, and stir over heat for 10 minutes.
Serve in a hot vegetable dish.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
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Lentils + oniontop 8% of all pairsSmell alikestrongCooked together1,221 recipes
Shared aroma: coumarin (sweet, hay).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Lentils + peppertop 13% of all pairsSmell alikemoderateCooked together812 recipes
Shared aroma: coumarin (sweet, hay).
-
Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Brown lentils
- Form the main body of the dish and hold their shape while simmering.
- Butter
- Adds fat and richness, and helps the onion fry to a golden colour.
- Onion
- Adds savoury sweetness and aroma as it browns in the butter.
- Stock
- Adds moisture and savoury flavour to the lentils and onion mixture.
The step that matters
Simmering the lentils uncovered. Lentils need steady, gentle simmering until tender. Boiling hard can break them apart and make them mushy, while undercooking leaves them firm and chalky.
Swap the lentils
How well each one fits the dish's main ingredients (butter, onion, pepper):
- Black-eyed peafits better
- Sesamefits better
- Beansfits better
- Lentilsthe original
Fit is the average pairing score against butter, onion, pepper. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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