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Onion Sauce

A creamy sauce made from onions, butter, milk, bread crumbs, pepper, salt, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Peel the onions and place them in cold water.

  2. Boil for 1 minute, then strain the water.

  3. Cover with cold water again and boil until soft.

  4. Remove from water and chop small.

Make the sauce

  1. In a saucepan, combine the butter and milk and bring to a boil.

  2. Add the bread crumbs and chopped onions to the boiling mixture.

  3. Cook slowly for 5 minutes.

  4. Season with pepper, salt, and a few drops of lemon juice.

  5. Serve warm.

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. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

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

  3. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  4. Milk + breadtop 11% of all pairs
    Smell alikemoderate
    Cooked together11,466 recipes

    Shared aroma: 2-undecenal (sweet).

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

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

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Onions
Provide the main flavor and soft body of the sauce once boiled and chopped.
Butter
Adds fat and richness, carrying flavor and giving the sauce a smooth mouthfeel.
Milk
Forms the liquid base of the sauce and adds creaminess and mild sweetness.
Bread crumbs
Thicken the milk as they absorb liquid and soften during slow cooking.

The step that matters

Cook slowly for 5 minutes. Milk scorches easily on direct heat and can stick or curdle if boiled hard. Gentle cooking lets the bread crumbs swell evenly and thicken the sauce smoothly.

Swap the onion

How well each one fits the dish's main ingredients (butter, milk, bread, pepper, lemon):

  1. Capsicumfits better
  2. Potatofits better
  3. Asparagusfits better
  4. Onionthe original

Fit is the average pairing score against butter, milk, bread, pepper, lemon. 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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