Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Eel Soup
Ingredients
Directions
Prepare the eels
Cut the eels into chunks without opening them, reserving the belly part for serving.
Make the soup
Simmer the remaining eels with the onion and mushrooms in 1 quart of water for a long time.
Remove the eels and let them cool; mince and pound them with the cooked vegetables.
Add mace, pepper, salt, and lemon zest; rub through a fine sieve and mix without boiling.
Incorporate 2 or 3 egg yolks or a little cream.
Serve
Serve the soup with pieces of eel and white toast.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Onion + mushroomtop 10% of all pairsSmell alikemoderateCooked together10,626 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).
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Mushroom + peppertop 11% of all pairsSmell alikemoderateCooked together13,580 recipes
Shared aroma: 2-nonenal (fatty, green).
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Mushroom + lemontop 15% of all pairsSmell alikemoderateCooked together4,633 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Egg yolks thicken the soup and give it a smooth, rich body when stirred in off the heat.
- Cream
- Adds richness and a softer, silkier texture to the soup.
- Eels
- Provide the main flavour and body of the soup once simmered and pounded.
The step that matters
Mix without boiling. Once egg yolks are added, boiling can curdle them and make the soup grainy. Keeping it below a boil lets the yolks thicken it smoothly.
Swap the onion
The recipe marks onion as optional. How well each one fits the dish's main ingredients (mushroom, mace, pepper, lemon, egg):
- Capsicumfits better
- Shallotfits better
- Spinachfits better
- Onionthe original
Fit is the average pairing score against mushroom, mace, pepper, lemon, 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.
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