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 ↓
Eels, Stewed
Ingredients
Directions
Prepare
Skin and clean the eels, then cut them into 2-inch pieces.
Place the eels in a jar with the butter, sliced onion, parsley, salt, and pepper.
Cook
Cover the jar tightly and place it in a saucepan of cold water.
Slowly bring the water to a boil and cook until the eels are tender, about 14 hours.
Serve
Once done, serve on a hot dish and strain the gravy over the eels.
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 + peppertop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
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).
-
Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eels
- Form the main body of the dish, and slow gentle cooking tenderises their firm flesh.
- Butter
- Adds richness and moisture, helping the eels stay soft during the long cooking.
- Onion
- Adds sweet, aromatic flavour that infuses into the gravy.
The step that matters
Bringing the water to a boil slowly. Eel flesh toughens and breaks apart when cooked too hard. Heating the water gradually and keeping the jar tightly covered lets the eels cook gently in their own juices and butter, keeping them tender and the gravy rich.
Swap the onion
How well each one fits the dish's main ingredients (butter, parsley, pepper):
- Carrotfits better
- Shallotfits better
- Potatofits better
- Onionthe original
Fit is the average pairing score against butter, parsley, 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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