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Split Pea Soup

A soup made from split peas, fried onions, butter, and salt, thickened with hot water or milk.

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 ↓

Split Pea Soup

Ingredients

Directions

Prepare

  1. Soak the split peas overnight.

Make the soup

  1. Cook the peas until tender.

  2. Mash the peas through a fine sieve.

  3. Stir in the fried onions, butter, and salt.

  4. Add hot water or milk to achieve desired consistency.

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. Peas + oniontop 13% of all pairs
    Smell alikemoderate
    Cooked together5,460 recipes

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

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

    Shared aroma: decanal (soap, orange peel).

  4. Peas + milktop 16% of all pairs
    Smell alikemoderate
    Cooked together1,309 recipes

    Shared aroma: hexanal (green, grassy).

  5. Peas + buttertop 16% of all pairs
    Smell alikemoderate
    Cooked together4,887 recipes

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

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

What each ingredient does

Split peas
Form the main body of the soup and thicken it as they break down during cooking.
Fried onions
Add savory, browned flavor and aroma to the soup.
Butter
Adds fat for richness and a smooth, silky mouthfeel.

Swap the onion

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

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

Fit is the average pairing score against peas, butter, milk. 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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