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Stewed Spanish Onion

A dish of slow‑cooked Spanish onions in a butter‑flour‑milk sauce, garnished with parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Stewed Spanish Onion

Ingredients

Directions

Prepare the onions

  1. Skin the onions and plunge them into boiling water.

  2. Cook slowly until tender, about 1 to 2 hours.

  3. Drain the water off.

Make the sauce

  1. In a saucepan, mix the butter, flour, and milk.

  2. Stir while boiling for 5 minutes until thickened.

  3. Add the drained onions to the sauce and heat through.

Serve

  1. Serve with chopped parsley sprinkled on top.

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

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

  2. Onion + parsleytop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

    Shared aroma: 2,4-decadienal (seaweed).

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + parsleytop 12% of all pairs
    Smell alikemoderate
    Cooked together16,675 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 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

Spanish onions
Forms the main body of the dish and turns soft and sweet during slow cooking.
Butter
Adds fat and richness to the sauce and helps carry flavour.
Flour
Thickens the milk into a smooth sauce as its starch swells with heat.
Milk
Forms the liquid base of the sauce, giving it a creamy texture.

The step that matters

Thickening the sauce. Flour only thickens fully when the mixture boils, so the starch can swell. Stirring while it boils keeps the sauce smooth and prevents lumps from forming.

Swap the onion

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

  1. Shallotfits better
  2. Potatofits better
  3. Chivefits better
  4. Onionthe original

Fit is the average pairing score against butter, flour, milk, parsley. 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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