Name: Stewed Eels, London Style
Ingredients: river eels; parsley butter sauce; salt; pepper; vinegar; bread; butter

Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓

Stewed Eels, London Style

Ingredients

Directions

Cut river eels into two-inch lengths.
Boil the eels until cooked in a parsley butter sauce.
Season with salt, pepper, and a little vinegar.
Serve in soup plates with bread and butter.

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.

Parsley + peppertop 2% of all pairs

Smell alikestrong

Cooked together34,122 recipes

Shared aroma: 4'-methylacetophenone (bitter almond).
Butter + breadtop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Pepper + vinegartop 14% of all pairs

Smell alikemoderate

Cooked together27,814 recipes

Shared aroma: 4'-methylacetophenone (bitter almond).
Butter + saucetop 15% of all pairs

Smell alikelow

Cooked together15,338 recipes

Shared aroma: ethanol (alcoholic, ethereal).
Parsley + buttertop 15% of all pairs

Smell alikemoderate

Cooked together28,563 recipes

Shared aroma: trans-2-hexenal (green, leafy).

Butter and sauce barely smell alike, yet cooks put them together in 15,338 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

Swap the parsley

How well each one fits the dish's main ingredients (butter, sauce, pepper, vinegar, bread):

Tarragonfits about as well
Parsleythe original
Capersfits about as well
Garlicfits less well

Fit is the average pairing score against butter, sauce, pepper, vinegar, bread. Candidates are from the same food group and used in at least 100 recipes.