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 ↓
To Pickle Walnuts
Ingredients
Directions
Prepare the walnuts
When walnuts are full grown and can be pierced with a pin, place them in a strong brine of salt and water for 8 days, changing the brine twice.
Spread the walnuts on a cloth in the sun until they change color.
Make the pickling vinegar
In a pot, boil the vinegar with white pepper, mustard seed, ginger, horseradish, allspice, long pepper, and mace for 15 minutes.
Add shallots and garlic to the vinegar 2 minutes before removing from heat.
Let the vinegar cool, then pour it over the walnuts.
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).
-
Ginger + allspicetop 1% of all pairsSmell alikestrongCooked together2,620 recipes
Shared aroma: estragole (anise, licorice).
-
Mustard + allspicetop 2% of all pairsSmell alikestrongCooked together1,928 recipes
Shared aroma: methyleugenol (clove, spice).
-
Horseradish + allspicetop 4% of all pairsSmell alikestrongCooked together654 recipes
Shared aroma: coumarin (sweet, hay).
-
Allspice + peppertop 5% of all pairsSmell alikestrongCooked together6,395 recipes
Shared aroma: estragole (anise, licorice).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Walnuts
- Provide the main body of the pickle, absorbing the spiced vinegar and softening as they cure.
- Vinegar
- Acts as the pickling liquid, preserving the walnuts and giving them their sharp, sour flavor.
- White mustard seed
- Adds sharp, pungent heat that mellows during the boil and flavors the vinegar.
- Whole white pepper
- Contributes warm, lingering pungency to the spiced vinegar.
- Shallots
- Add mild onion sweetness and aroma to the pickling liquid.
The step that matters
Boiling the vinegar with spices. Boiling extracts the aromatic and pungent compounds from the spices into the vinegar. Adding the shallots and garlic only briefly keeps them crisp and mild rather than overcooked and bitter.
Swap the white pepper
How well each one fits the dish's main ingredients (walnut, vinegar, mustard, ginger, horseradish, allspice, pepper):
- Clovefits better
- Turmericfits better
- Tarragonfits better
- White pepperthe original
Fit is the average pairing score against walnut, vinegar, mustard, ginger, horseradish, allspice, pepper. 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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