Why it works: Mustard and horseradish match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,832 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Mother's Tomato Chow Chow
Ingredients
Directions
Prepare the vegetables
Chop the green tomatoes, onions, and bell peppers finely.
Mix with coarse sea salt and let drain overnight.
In the morning, scald the mixture in weak vinegar and pour off the liquid.
Cook
Place the mixture in strong vinegar and cook slowly until tender.
While cooking, add sugar, white mustard, horseradish, celery seed, red peppers, cinnamon, cloves, and allspice.
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 + horseradishtop 1% of all pairsSmell alikestrongCooked together1,832 recipes
Shared aroma: coumarin (sweet, hay).
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Mustard + celerytop 2% of all pairsSmell alikemoderateCooked together4,169 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Tomato + celerytop 4% of all pairsSmell alikemoderateCooked together3,377 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Pepper + celerytop 5% of all pairsSmell alikestrongCooked together16,012 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 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
- Green tomatoes
- Provide the bulk of the chow chow and soften into a tender, chunky texture when cooked.
- Onions
- Add savory depth and body as they soften during the slow cook.
- Bell peppers
- Contribute bulk, mild sweetness, and tender texture to the relish.
- Sugar
- Sweetens the relish and balances the sharpness of the vinegar.
- Strong vinegar
- Provides the acidity that preserves the relish and gives it its tangy flavor.
- White mustard seeds
- Add a sharp, pungent flavor that mellows during cooking.
The step that matters
Scalding in weak vinegar, then pouring off the liquid. Scalding draws out excess moisture and softens the vegetables, while pouring off the liquid removes water that would otherwise dilute the vinegar and weaken the final texture and preservation.
Swap the tomato
How well each one fits the dish's main ingredients (onion, pepper, vinegar, sugar, mustard, horseradish, celery):
- Broccolifits better
- Lettucefits better
- Beetrootfits better
- Tomatothe original
Fit is the average pairing score against onion, pepper, vinegar, sugar, mustard, horseradish, celery. 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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