Why it works: Butter and parsley are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 28,563 recipes. Both carry trans-2-hexenal, which smells green, leafy. The science ↓
Black Butter
Ingredients
Directions
Make the black butter
Melt the butter in a frying pan until it darkens, being careful not to burn it.
Add the parsley and let it fry briefly.
Finish and serve
Pour the butter and parsley over the boiled fish.
Quickly add the vinegar to the frying pan, heat it, and pour it over the fish 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.
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Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Parsley + vinegartop 16% of all pairsSmell alikemoderateCooked together6,477 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + vinegartop 23% of all pairsSmell alikemoderateCooked together13,513 recipes
Shared aroma: isoamyl acetate (banana, pear).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Browns into a nutty, toasted-flavored sauce as its milk solids darken in the pan.
- Vinegar
- Adds sharp acidity that cuts the richness of the butter and balances the dish.
The step that matters
Darkening the butter without burning it. Butter's milk solids toast as it heats, giving nutty flavor and color. Past that point they scorch, turning the sauce bitter and acrid, so the pan must be watched closely.
Swap the parsley
How well each one fits the dish's main ingredients (butter, vinegar):
- Tarragonfits better
- Garlicfits about as well
- Parsleythe original
- Capersfits about as well
Fit is the average pairing score against butter, vinegar. 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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