Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Stewed Onions
Ingredients
Directions
Prepare
Skin and wash the onions.
Dredge the onions with flour.
Fry the onions lightly in butter.
Stew and serve
Place the onions in a stewpan and barely cover them with stock.
Season well and cook until tender, being careful not to break them.
Dish the onions and pour the gravy over them.
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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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Onion + flourtop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Onions
- Form the main body of the dish, becoming soft and sweet as they stew.
- Flour
- Coats the onions and thickens the stock into a gravy as it cooks.
- Butter
- Adds fat and richness, and helps the onions brown lightly when fried.
- Stock
- Provides the liquid that cooks the onions and forms the savory gravy.
The step that matters
Cook until tender without breaking the onions. Onions soften as their cell walls break down with gentle heat. Covering them barely with stock and cooking slowly keeps them whole, while vigorous boiling or stirring can make them fall apart.
Swap the onion
How well each one fits the dish's main ingredients (flour, butter):
- Shallotfits better
- Leekfits better
- Arrowrootfits better
- Onionthe original
Fit is the average pairing score against flour, butter. 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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