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Onion Soup

A savory soup made with onions, butter, flour, water, beef extract, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Onion and beef are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,092 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Onion Soup

Ingredients

Directions

Prepare the onions

  1. Boil the onions in 1 cup of cold water for 10 minutes.

  2. Drain the onions and sauté them in the butter for 4 to 5 minutes.

Make the soup

  1. Stir in the flour and cook until browned.

  2. Add the hot water, season with salt and pepper, and stir in the beef extract.

  3. Cook slowly for 20 minutes.

  4. Strain the soup and serve with a garnish of grated cheese.

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 + beeftop 7% of all pairs
    Smell alikemoderate
    Cooked together17,092 recipes

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

  2. Pepper + beeftop 10% of all pairs
    Smell alikemoderate
    Cooked together18,971 recipes

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

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

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

  4. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: decanal (soap, orange peel).

Flour and butter 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
Provide the main body and sweet, savory flavor of the soup.
Flour
Browns with the butter and onions and thickens the soup slightly.
Beef extract
Adds concentrated savory, meaty flavor to the broth.
Butter
Carries fat for sautéing the onions, adding richness and browning.

The step that matters

Cooking the flour until browned. Flour must brown in the butter and onion fat without burning; browning builds deeper flavor, and burnt starch tastes bitter before the liquid is added.

Swap the onion

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

  1. Potatofits about as well
  2. Chivefits about as well
  3. Leekfits about as well
  4. Onionthe original

Fit is the average pairing score against flour, butter, pepper, beef. 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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