Why it works: Onion and mustard 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 ↓
Chili Sauce
Ingredients
Directions
Prepare
Scald and peel the tomatoes, removing the tough center core.
Chop the peeled onions finely and add them to the tomatoes.
Add all other ingredients and cut the tomatoes into small pieces.
Place the mixture in a granite kettle.
Cook and seal
Cook together, stirring frequently, until the sauce thickens, about 1 hour or longer.
For a spicier sauce, add more of the flavoring ingredients as desired.
Seal in airtight bottles.
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 + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Cinnamon + mustardtop 7% of all pairsSmell alikestrongCooked together1,581 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Tomato + oniontop 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
- Red tomatoes
- Provide the bulk and liquid that cook down into the sauce body.
- Onions
- Add savory depth and body as they soften during cooking.
- Vinegar
- Adds acidity that sharpens flavor and helps preserve the sauce.
- Sugar
- Adds sweetness and, as it thickens with the tomatoes, contributes to the sauce's body.
The step that matters
Cook together, stirring frequently, until the sauce thickens. Sugar and tomato solids can scorch on the bottom of the kettle during long cooking. Frequent stirring spreads heat evenly and keeps the sauce from burning while it reduces and thickens.
Swap the white pepper
How well each one fits the dish's main ingredients (tomato, onion, vinegar, sugar, pepper, cinnamon, mustard):
- Allspicefits better
- Tarragonfits better
- Cuminfits better
- White pepperthe original
Fit is the average pairing score against tomato, onion, vinegar, sugar, pepper, cinnamon, 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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