Why it works: Leek and parsley match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 759 recipes. Both carry trans-2-hexenal, which smells green, leafy. The science ↓
A Nice Way to Serve Cold Beef
Ingredients
Directions
Prepare
Slice the cold roast beef and place it in a pan.
Cover the beef with gravy.
Make the sauce
Mix hot water, butter, and browned flour in a pan.
Simmer the mixture gently for 30 minutes in a covered pan.
Serve
If desired, add sliced leek and chopped parsley to the beef.
Serve with boiled or mashed potatoes, garnished with parsley, mustard, and tomato catsup.
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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Leek + parsleytop 4% of all pairsSmell alikestrongCooked together759 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Parsley + potatotop 5% of all pairsSmell alikemoderateCooked together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Leek + potatotop 6% of all pairsSmell alikemoderateCooked together30 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
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Leek + mustardtop 6% of all pairsSmell alikestrongCooked together21 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Potato + mustardtop 7% of all pairsSmell alikemoderateCooked together1,340 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Cold roast beef
- Forms the main body of the dish, gently rewarmed in the sauce.
- Butter
- Adds richness and a smooth mouthfeel to the sauce.
- Browned flour
- Thickens the liquid and adds a toasted, nutty flavour to the sauce.
- Hot water
- Forms the liquid base that the flour thickens into sauce.
The step that matters
Simmering the sauce gently. Flour thickens liquid as its starch swells with heat. Simmering gently over a covered pan keeps the sauce from scorching or boiling down unevenly and helps the thickening set smoothly.
Swap the leek
The recipe marks leek as optional. How well each one fits the dish's main ingredients (beef, wine, butter, flour, parsley, potato, mustard):
- Shallotfits better
- Chivefits better
- Horseradishfits about as well
- Leekthe original
Fit is the average pairing score against beef, wine, butter, flour, parsley, potato, mustard. 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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