Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
On Baking Meat
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point. The book gives no cooking times either; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.
Prepare
Preheat the oven to 350°F (175°C).
Parboil and peel the potatoes.
Shred the onion.
Bake
Place the leg of mutton in a baking dish.
Add the parboiled potatoes and shredded onion around the meat.
Season with coarse sea salt and add butter on top.
Cover the dish and bake for 1.5 to 2 hours, or until the meat is tender.
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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Potato + oniontop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + buttertop 13% of all pairsSmell alikemoderateCooked together6,456 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Mutton + buttertop 16% of all pairsSmell alikemoderateCooked together3,781 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Mutton + oniontop 18% of all pairsSmell alikelowCooked together4,531 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Leg of mutton
- Provides the main meat, which becomes tender and juicy during slow covered baking.
- Potatoes
- Absorb meat juices and fats, becoming soft and flavorful as they bake.
- Onion
- Softens and sweetens as it bakes, adding aroma to the meat juices.
- Butter
- Adds fat that enriches the juices and promotes gentle browning on top.
The step that matters
Cover the dish and bake until the meat is tender. Covering traps steam so the tough connective tissue in the mutton breaks down slowly with moist heat. Checking for tenderness rather than relying only on the clock matters, because cuts vary in size and thickness.
Swap the onion
How well each one fits the dish's main ingredients (mutton, potato, butter):
- Onionthe original
- Leekfits about as well
- Chivefits about as well
- Asparagusfits about as well
Fit is the average pairing score against mutton, potato, butter. 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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