Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Roast Mutton
Ingredients
Directions
The book says “a moderately hot oven”. The 400°F in the steps is the modern equivalent, not the book's own figure.
Prepare
Trim off inedible parts of the mutton and wash it well, then dry with a clean cloth.
Place the mutton in a roasting pan with a little water to baste initially.
Roast
Roast for about 12 minutes per pound in a strong oven (400°F/200°C).
Do not salt at first; add salt after it begins to roast well.
Baste often and cover with white paper if it browns too quickly.
A quarter hour before done, lightly dredge with flour and baste with butter.
Serve
Skim the gravy and thicken slightly with brown flour before serving.
Serve with currant jelly or other tart sauce.
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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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + curranttop 17% of all pairsSmell alikemoderateCooked together7,856 recipes
Shared aroma: isoamyl acetate (banana, pear).
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Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter barely smell alike, yet cooks put them together in 124,287 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
What each ingredient does
- Mutton (in the method)
- Provides the meat that becomes tender and flavourful as it roasts slowly.
- Flour
- Dredged over the surface and used to thicken the gravy, helping it brown and lightly bind.
- Butter
- Basted over the roast to add fat, richness and golden browning on the surface.
- Currant jelly
- Its tartness and sweetness balance the rich, fatty flavour of the roasted meat.
The step that matters
Salting timing. Salting before the surface begins to roast can draw out moisture and slow browning. Adding salt once the meat is roasting well lets the surface develop flavour and colour more evenly.
Swap the onion
The recipe marks onion as optional. How well each one fits the dish's main ingredients (flour, butter, currant, pepper):
- Shallotfits better
- Capsicumfits better
- Arrowrootfits better
- Onionthe original
Fit is the average pairing score against flour, butter, currant, 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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