Why it works: Peas and onion are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 5,460 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Sago Pea Soup
Ingredients
Directions
Prepare the peas
Wash, soak, and cook the split peas in plenty of water until tender.
Rub the peas through a colander and return to the pot.
Add enough hot water to make 3 pints in total.
Add onion slices.
Finish the soup
Wash the sago in warm water.
Stir the sago gradually into the soup.
Simmer for 30 minutes or until well dissolved.
Remove the onion.
Season with coarse sea salt.
Combine the cream or milk with the beaten egg yolk.
Stir the mixture into the soup a few minutes before serving.
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.
-
Peas + oniontop 13% of all pairsSmell alikemoderateCooked together5,460 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + creamtop 18% of all pairsSmell alikelowCooked together10,827 recipes
Shared aroma: 2-nonanone (fruity, floral).
-
Peas + eggtop 22% of all pairsSmell alikemoderateCooked together2,065 recipes
Shared aroma: 2-octenal (fatty, green).
-
Cream + eggtop 24% of all pairsSmell alikelowCooked together42,166 recipes
Shared aroma: acetic acid (sour, vinegar).
-
Peas + creamtop 29% of all pairsSmell alikelowCooked together1,400 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
Onion and cream barely smell alike, yet cooks put them together in 10,827 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
- Split peas
- Cooked and puréed, they give the soup its body and thick texture.
- Sago
- Starch that thickens the soup as it simmers and dissolves.
- Egg yolk
- Enriches the soup and adds richness when stirred in at the end.
- Cream or milk
- Adds fat and creaminess, softening the flavour and texture.
The step that matters
Stir the egg yolk mixture in at the end. Adding the egg and cream to a boiling soup can scramble the egg yolk and curdle the dairy. Stirring it in a few minutes before serving, off the boil, keeps the soup smooth.
Swap the onion
How well each one fits the dish's main ingredients (peas, cream, egg):
- Asparagusfits better
- Leekfits better
- Spinachfits better
- Onionthe original
Fit is the average pairing score against peas, cream, egg. 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.
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Green Peas229 recipes
Green Peas Soup35 recipes
Tomato Soup526 recipes
Brown Bread461 recipes