Why it works: Mustard and onion match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Sliced Beef with Tomato Sauce
Ingredients
Directions
Make the sauce
In a skillet, melt the butter over medium heat.
Add the chopped onion and cook until light yellow.
Gradually stir in the stewed tomato, then add the stock or gravy, Worcestershire sauce, and mustard.
Season with salt and cayenne pepper.
Serve
Warm the slices of beef in the sauce 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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Mustard + oniontop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + beeftop 7% of all pairsSmell alikemoderateCooked together17,092 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + beeftop 8% of all pairsSmell alikemoderateCooked together5,448 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + tomatotop 8% of all pairsSmell alikemoderateCooked together20,633 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
- Onion
- Softens and adds sweetness and aroma as it cooks gently in butter.
- Stewed tomato
- Provides acidity, body and a rich tomato flavour to the sauce.
- Stock or gravy
- Forms the liquid base of the sauce and carries its savoury flavour.
- Butter
- Adds fat and richness, and helps cook the onion without browning it.
- Worcestershire sauce
- Adds savoury depth and a tangy, slightly sharp note to the sauce.
The step that matters
Warm the beef in the sauce. Keeping the heat gentle stops the beef from toughening and the sauce from scorching or reducing too far. Beef held at a gentle warmth stays tender, while high heat makes muscle fibres tighten and dry out.
Swap the mustard
How well each one fits the dish's main ingredients (onion, butter, tomato, sauce, pepper, beef):
- Capsicumfits better
- Potatofits better
- Carrotfits better
- Mustardthe original
Fit is the average pairing score against onion, butter, tomato, sauce, pepper, beef. 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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