Why it works: Tomato and pepper are a kitchen classic. They rank in the top 7% of all ingredient pairs, and 17,923 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Tomato Sauce
Ingredients
Directions
Melt the butter in a stewpan.
Add the onions, ham, vinegar, and all seasonings.
Stir the mixture over medium heat for about 15 minutes until it thickens.
Add the tomatoes and simmer for another 5 minutes.
Strain the sauce through a sieve and reheat 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 aroma chemistry they share, and how many recipes mention both.
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Tomato + peppertop 7% of all pairsAroma overlapmoderateMentioned together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + oniontop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + peppertop 11% of all pairsAroma overlapmoderateMentioned together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + vinegartop 14% of all pairsAroma overlapmoderateMentioned together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Vinegar + peppertop 14% of all pairsAroma overlapmoderateMentioned together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Onions
- Softens as it cooks, adding sweetness and body to the sauce base.
- Tomatoes
- Provide the main liquid and acidic flavour that forms the body of the sauce.
- Butter
- Carries flavour and adds richness as the onions cook gently in it.
- Ham
- Adds savoury, salty depth to the sauce.
The step that matters
Stirring over medium heat until it thickens. Cooking the onions and seasonings gently lets moisture evaporate and the sugars soften, so the mixture thickens without scorching. Too much heat can burn the onions and make the sauce bitter.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, ham, butter, vinegar, pepper):
- Capsicumbetter flavor fit
- Mustardabout as good a flavor fit
- Onionthe original
- Cucumberabout as good a flavor fit
Fit is the average pairing score against tomato, ham, butter, vinegar, pepper. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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