Name: Cucumber Vinegar
Ingredients: 15 large cucumbers; 3 pints vinegar; 4 large onions; 2 or 3 shallots; a little garlic; 2 tablespoons coarse sea salt; 3 teaspoons pepper; ½ teaspoon cayenne

Why it works: Onion and garlic match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 29,058 recipes. Both carry furaneol, which smells caramel, strawberry. The science ↓

Cucumber Vinegar

Ingredients

Directions

Prepare

Pare and slice the cucumbers.
Place them in a stone jar with vinegar, onions, shallots, garlic, salt, pepper, and cayenne.

Steep and cook

Let the mixture stand for 4 days.
After 4 days, bring the mixture to a boil.

Strain and store

Once cooled, strain and filter the liquid through paper.
Store in small bottles to add to salad or serve with meat.

Recipe from a historical cookbook (Internet Archive).

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.

Onion + garlictop 1% of all pairs

Smell alikestrong

Cooked together29,058 recipes

Shared aroma: furaneol (caramel, strawberry).
Cucumber + shallottop 3% of all pairs

Smell alikestrong

Cooked together264 recipes

Shared aroma: eucalyptol (eucalyptus, herbal).
Cucumber + garlictop 4% of all pairs

Smell alikestrong

Cooked together2,556 recipes

Shared aroma: linalool (floral, citrus).
Shallot + garlictop 4% of all pairs

Smell alikestrong

Cooked together2,000 recipes

Shared aroma: coumarin (sweet, hay).
Garlic + peppertop 8% of all pairs

Smell alikemoderate

Cooked together27,090 recipes

Shared aroma: beta-phellandrene (minty, terpene).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Cucumbers: Provide the main vegetable flavour and body that the vinegar draws out and carries.
Vinegar: Acts as the preserving liquid and gives the sharp, acidic character of the condiment.
Onions: Add savoury sweetness and aroma that mellows during the long steep.
Shallots: Contribute a mild, delicate onion aroma to the infused liquid.
Cayenne: Adds heat that infuses into the vinegar over the steeping period.

The step that matters

Bringing the mixture to a boil after steeping. Boiling after the four-day steep helps stabilise the liquid for storage and drives off some harsh raw notes. Overboiling can cook off the vinegar's sharpness and soften the cucumber, so the mixture should be heated just to a boil and then allowed to cool before straining.

Swap the onion

How well each one fits the dish's main ingredients (cucumber, vinegar, shallot, garlic, pepper):

Chivefits better
Kalefits better
Mustardfits better
Onionthe original

Fit is the average pairing score against cucumber, vinegar, shallot, garlic, 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.

Raspberry Vinegar214 recipes

Cucumber Pickles25 recipes

Sugar Vinegar20 recipes

Vegetable Soup350 recipes

Like knowing why a recipe works?

The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.

Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Cucumber Vinegar