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Onion Soup

From an old cookbook · modernised transcription
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Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Onion Soup

Ingredients

Directions

  1. In a saucepan, melt the butter over medium heat.

  2. Add the sliced onions and cook until they are red.

  3. Stir in the flour and cook until it turns red, being careful not to burn it.

  4. Pour in the boiling water, add pepper and salt, and mix well.

  5. Let it boil for one minute, then transfer to a soup kettle and keep warm.

  6. Add the boiling milk to the soup.

  7. Mash the boiled potatoes and gradually mix in some soup until smooth.

  8. Pour the potato mixture into the soup kettle and stir well.

  9. Taste and adjust seasoning with more pepper and salt if needed.

  10. Let it simmer for a few minutes and serve with pieces of toasted bread.

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. Onion + potatotop 3% of all pairs
    Smell alikemoderate
    Cooked together9,023 recipes

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

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

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

  3. Milk + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

  4. Potato + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together8,305 recipes

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

  5. Milk + potatotop 9% of all pairs
    Smell alikemoderate
    Cooked together3,611 recipes

    Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

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

Swap the onion

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

  1. Capsicumfits better
  2. Tomatofits better
  3. Asparagusfits about as well
  4. Onionthe original

Fit is the average pairing score against milk, potato, butter, pepper, bread. Candidates are from the same food group and used in at least 100 recipes.

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