Why it works: Parsley and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 14,037 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓
Eel Soup
Ingredients
Directions
Prepare
Clean the eels, removing all fat, and cut into short pieces.
Fry the chopped onion in plenty of dripping until brown.
Wipe the eels dry and fry them in the same dripping.
Make the soup
Put the eels and onion into a pot with the mace and cover with 3 quarts of cold water.
Stew slowly for 2 hours.
Season with pepper and salt.
Stir in the floured butter.
Simmer for 3 minutes.
Add lemon juice.
Pour out.
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.
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Parsley + lemontop 1% of all pairsSmell alikestrongCooked together14,037 recipes
Shared aroma: beta-phellandrene (minty, terpene).
-
Parsley + peppertop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Onion + parsleytop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eels
- Provide the main body and rich flavour of the soup.
- Butter, rolled in flour
- Thickens the broth slightly as it simmers, giving it body.
- Onion
- Browning in dripping builds a deeper, sweeter savoury base for the broth.
- Lemon juice
- Adds acidity that brightens the rich, fatty broth.
The step that matters
Removing all fat from the eels. Eel fat is rich and can turn the broth greasy and heavy, so trimming it before cooking keeps the soup clean-tasting.
Swap the mace
How well each one fits the dish's main ingredients (onion, parsley, pepper, lemon, butter, flour):
- Thymefits better
- Marjoramfits better
- Tarragonfits better
- Macethe original
Fit is the average pairing score against onion, parsley, pepper, lemon, butter, flour. 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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