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Fried Onion Soup

A soup made by frying onions in butter, then adding stock and seasoning.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Fried Onion Soup

Ingredients

Directions

Prepare

  1. Slice the onions.

  2. Fry the onions in butter until thoroughly cooked.

Make the soup

  1. Add meat soup or stock.

  2. Season with pepper and salt.

  3. Do not strain; serve with onions in the soup.

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

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

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

    Shared aroma: decanal (soap, orange peel).

  3. Butter + meattop 16% of all pairs
    Smell alikemoderate
    Cooked together7,594 recipes

    Shared aroma: guaiacol (smoky, sweet).

  4. Onion + meattop 17% of all pairs
    Smell alikelow
    Cooked together6,364 recipes

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

  5. Meat + peppertop 19% of all pairs
    Smell alikelow
    Cooked together8,777 recipes

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

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

What each ingredient does

Onions
Provide the main bulk and sweetness as they soften and caramelize in the fat.
Butter
Carries the heat for frying and adds richness and browning to the onions.
Meat soup or stock
Forms the liquid base that carries the flavor of the soup.

The step that matters

Fry the onions until thoroughly cooked. Onions cooked slowly in butter until soft and deeply golden develop sweetness and savory depth. Under-cooked onions stay sharp and pale, giving the soup a raw, harsh flavor.

Swap the onion

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

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

Fit is the average pairing score against butter, meat, 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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