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Split Pea Soup

A simple soup made from split peas, potatoes, celery, onion, pepper, and salt, served with toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Potato and onion 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 ↓

Split Pea Soup

Ingredients

Directions

Prepare

  1. Soak the split peas in water overnight after picking and washing them.

Cook and strain

  1. In the morning, set the peas over the fire and cook with the potatoes, celery, and onion until tender.

  2. Rub the mixture through a sieve into a saucepan.

Season and serve

  1. Add pepper, coarse sea salt, and a little water if necessary; bring to a boil.

  2. Serve with slices of toast.

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. Potato + oniontop 3% of all pairs
    Smell alikemoderate
    Cooked together9,023 recipes

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

  2. Celery + peppertop 5% of all pairs
    Smell alikestrong
    Cooked together16,012 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  3. Potato + celerytop 7% of all pairs
    Smell alikemoderate
    Cooked together2,047 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  4. Celery + oniontop 7% of all pairs
    Smell alikemoderate
    Cooked together18,518 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Peas + potatotop 9% of all pairs
    Smell alikemoderate
    Cooked together1,016 recipes

    Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).

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

What each ingredient does

Split peas
Form the body of the soup and thicken it as they break down during cooking.
Potatoes
Add starch that helps give the soup a smooth, thick texture.

The step that matters

Rub the mixture through a sieve. Passing the cooked peas, potatoes, celery, and onion through a sieve breaks them into a fine purée. Any pieces left unbroken will make the soup grainy rather than smooth.

Swap the peas

How well each one fits the dish's main ingredients (potato, celery, onion, pepper):

  1. Beansfits better
  2. Black-eyed peafits better
  3. Chickpeafits better
  4. Peasthe original

Fit is the average pairing score against potato, celery, onion, 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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