Why it works: Horseradish and mustard 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 ↓
Chow-chow
Ingredients
Directions
Prepare
Chop the green tomatoes, onions, cucumbers, green peppers, and cabbage.
Grate the horseradish.
Cook
Combine all ingredients in a large pot.
Cover with good vinegar.
Boil slowly for two hours, stirring often.
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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Horseradish + mustardtop 1% of all pairsSmell alikestrongCooked together1,832 recipes
Shared aroma: coumarin (sweet, hay).
-
Mustard + celerytop 2% of all pairsSmell alikemoderateCooked together4,169 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Cucumber + horseradishtop 2% of all pairsSmell alikestrongCooked together640 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Cabbage + horseradishtop 2% of all pairsSmell alikestrongCooked together481 recipes
Shared aroma: coumarin (sweet, hay).
-
Cucumber + mustardtop 3% of all pairsSmell alikestrongCooked together2,281 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 a tart, firm body that holds up to long simmering.
- Onions
- Add savory sweetness and aroma that deepens during the long cooking.
- Cabbage
- Adds crisp-tender texture and bulk to the chopped vegetable mixture.
- Horseradish
- Contributes sharp, pungent heat that mellows with cooking.
- Vinegar
- Provides acidity that preserves the vegetables and gives the relish its tang.
The step that matters
Boil slowly for two hours, stirring often. Long, gentle simmering softens the vegetables and blends the vinegar and flavors, while frequent stirring keeps the mixture from scorching on the bottom of the pot.
Swap the tomato
How well each one fits the dish's main ingredients (onion, cucumber, pepper, cabbage, horseradish, mustard, celery):
- Lettucefits better
- Broccolifits better
- Turnipfits better
- Tomatothe original
Fit is the average pairing score against onion, cucumber, pepper, cabbage, horseradish, mustard, 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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