Why it works: Pepper and clove match in chemistry and in kitchens. They rank in the top 5% of all ingredient pairs, and cooks put them together in 17,451 recipes. Both carry ethyl octanoate, which smells fruity, wine. The science ↓
Another Good Receipt for Walnut Catsup
Ingredients
Directions
Macerate
Bruise the walnuts in a large marble mortar until thoroughly broken.
Place the walnuts in a stone jar with the sliced eschalots, garlic, salt, and vinegar.
Let the mixture stand for 10 days.
Stir it morning and night.
Strain off the liquid.
Boil and bottle
Boil it for 30 minutes with anchovies, black pepper, cloves, and mace.
Skim the mixture well.
Strain it again.
Let it cool.
Pour the liquid gently from the sediment into small dry bottles.
Cork the bottles securely.
Store them in a dry place.
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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Pepper + clovetop 5% of all pairsSmell alikestrongCooked together17,451 recipes
Shared aroma: ethyl octanoate (fruity, wine).
-
Clove + macetop 6% of all pairsSmell alikelowCooked together8,400 recipes
Shared aroma: methyleugenol (clove, spice).
-
Garlic + peppertop 8% of all pairsSmell alikemoderateCooked together27,090 recipes
Shared aroma: beta-phellandrene (minty, terpene).
-
Walnut + clovetop 9% of all pairsSmell alikestrongCooked together1,592 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Garlic + clovetop 10% of all pairsSmell alikemoderateCooked together11,368 recipes
Shared aroma: linalool (floral, citrus).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Green walnuts
- Provide the main flavour base and bitter, astringent character of the ketchup.
- Vinegar
- Acts as the preserving liquid and extracts flavour from the walnuts and aromatics.
- Anchovies
- Add savoury depth, adding umami that rounds out the sauce.
- Eschalots
- Contribute mild onion sweetness and aromatic body to the liquid.
- Coarse sea salt
- Draws moisture out and helps preserve the mixture during its long standing.
The step that matters
Straining off the liquid after 10 days. Sediment left in the liquid can cloud the ketchup and spoil it over time, so the liquid should be poured off gently and strained clearly before boiling and bottling.
Swap the mace
How well each one fits the dish's main ingredients (walnut, garlic, vinegar, pepper, clove):
- Allspicefits better
- Tarragonfits better
- Thymefits better
- Macethe original
Fit is the average pairing score against walnut, garlic, vinegar, pepper, clove. 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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