Why it works: Parsley and onion are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 25,843 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓
Roast Lamb
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Preheat your oven to 400°F (200°C).
Knead the butter with parsley, green onions, and fine herbs until well combined. Form the mixture into a ball.
Roast and serve
Carefully place the butter ball under the shoulder of the lamb before carving.
Roast the lamb until tender and serve.
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 + oniontop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Lamb + parsleytop 11% of all pairsSmell alikemoderateCooked together1,322 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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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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Lamb + oniontop 16% of all pairsSmell alikemoderateCooked together2,407 recipes
Shared aroma: gamma-nonanolactone (coconut, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Lamb
- Forms the main body of the dish, and its connective tissue softens into tender meat during roasting.
- Fresh butter
- Adds fat and moisture, melting slowly to baste the meat as it roasts.
- Parsley
- Adds fresh, green aroma that brightens the rich, fatty butter.
- Green onions
- Contributes mild onion flavour and aroma to the herb butter.
- Fine herbs
- Adds aromatic flavour that perfumes the butter and the meat around it.
The step that matters
Placing the butter ball under the shoulder. The butter must stay cold and firm enough to hold its shape while you place it, so it does not melt into the surface before roasting. Handling it gently keeps it in a pocket that melts slowly and bastes the meat from within as the fat renders.
Swap the onion
How well each one fits the dish's main ingredients (lamb, butter, parsley):
- Potatofits better
- Shallotfits better
- Carrotfits better
- Onionthe original
Fit is the average pairing score against lamb, butter, parsley. 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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