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Roast Onions

Roasted onions served with a butter‑flour‑cream sauce.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and cream are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 41,516 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓

Roast Onions

Ingredients

Directions

Roast the onions

  1. Select large onions of uniform size and do not remove the outer peeling.

  2. Roast the onions slowly in a baking pan with the jackets on until tender.

  3. Peel the onions and place them in a covered dish, keeping them steaming hot.

Make the sauce

  1. In a pan, heat 1 tablespoon of butter.

  2. Rub in 1 tablespoon of flour and add ½ cup of cream.

  3. Heat the mixture without scorching the butter or letting it boil.

  4. Add ½ teaspoon of salt and ¼ teaspoon of pepper.

  5. Pour the sauce over the onions and serve.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Butter + creamtop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

  2. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Onion + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  5. Onion + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together32,460 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour 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; slow roasting softens their flesh and concentrates their sweetness.
Butter
Adds richness and fat, carrying flavour into the sauce.
Flour
Thickens the cream into a smooth sauce when cooked with the butter.
Cream
Forms the body of the sauce, adding richness and a silky texture.

The step that matters

Heat the cream mixture gently. Overheating scorches the butter and can make the flour-thickened cream boil and separate or turn grainy. Gentle heat keeps the sauce smooth and mellow.

Swap the onion

How well each one fits the dish's main ingredients (butter, flour, cream, pepper):

  1. Spinachfits better
  2. Leekfits better
  3. Potatofits better
  4. Onionthe original

Fit is the average pairing score against butter, flour, cream, 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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