Why it works: Clove and cinnamon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 14,189 recipes. Both carry ethyl cinnamate, which smells sweet, balsamic. The science ↓
Apple Catsup
Ingredients
Directions
Prepare the apples
Peel and quarter the apples.
Stew the apples in as little water as possible until soft.
Pass the stewed apples through a sieve.
Make the ketchup
To the sifted apples, add sugar, pepper, cloves, mustard, cinnamon, and chopped onions.
Stir in the coarse sea salt and vinegar.
Place the mixture over the fire and boil for one hour.
Bottle
Bottle the catsup while hot and seal tightly.
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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Clove + cinnamontop 1% of all pairsSmell alikestrongCooked together14,189 recipes
Shared aroma: ethyl cinnamate (sweet, balsamic).
-
Apple + cinnamontop 4% of all pairsSmell alikemoderateCooked together5,598 recipes
Shared aroma: methyl cinnamate (strawberry).
-
Pepper + clovetop 5% of all pairsSmell alikestrongCooked together17,451 recipes
Shared aroma: ethyl octanoate (fruity, wine).
-
Mustard + oniontop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Apple + clovetop 6% of all pairsSmell alikemoderateCooked together2,774 recipes
Shared aroma: ethyl octanoate (fruity, wine).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Tart apples
- Provide the main body and pectin that thicken the sauce as it cooks.
- Sugar
- Adds sweetness and helps balance the sharpness of the vinegar and apples.
- Vinegar
- Adds acidity that gives the ketchup its tang and helps preserve it.
- Onions
- Add savory depth and aroma to the sauce as they soften and cook down.
The step that matters
Boil for one hour. The long boil must reduce the sieved apple mixture to a thick, spreadable consistency. Too little cooking leaves it thin and watery, and it may spoil sooner in the bottle.
Swap the onion
How well each one fits the dish's main ingredients (apple, sugar, pepper, clove, mustard, cinnamon, vinegar):
- Horseradishfits better
- Capsicumfits better
- Radishfits better
- Onionthe original
Fit is the average pairing score against apple, sugar, pepper, clove, mustard, cinnamon, vinegar. 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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