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Cucumber Catsup

A pickled cucumber and onion relish seasoned with salt, mustard seed, pepper, and cider vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Cucumber and mustard match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 2,281 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Cucumber Catsup

Ingredients

Directions

Prepare

  1. Combine the chopped cucumbers and onions in a bowl. Sprinkle with coarse sea salt and mix well.

  2. Place the mixture in a sieve and let it drain overnight.

Season and pack

  1. Add mustard seed and ground black pepper to the drained mixture. Mix well and cover with cider vinegar.

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.

  1. Cucumber + mustardtop 3% of all pairs
    Smell alikestrong
    Cooked together2,281 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Onion + mustardtop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Cider + vinegartop 6% of all pairs
    Smell alikemoderate
    Cooked together3,431 recipes

    Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).

  4. Mustard + vinegartop 7% of all pairs
    Smell alikemoderate
    Cooked together14,067 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Cucumber + oniontop 8% of all pairs
    Smell alikestrong
    Cooked together6,050 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

Cucumbers
Provide the bulk of the relish and its crisp texture when kept finely chopped.
Onions
Add savory sharpness and aroma that deepen as the relish stands.
Coarse sea salt
Draws water out of the vegetables, so the relish stays crisp rather than soggy.
Mustard seed
Contributes pungent flavor and a bit of crunch to the relish.
Cider vinegar
Adds acidity that sharpens the flavor and helps keep the relish preserved.

The step that matters

Draining overnight. Salt and draining pull excess water out of the cucumbers and onions. If they are not drained well, the relish will be watery and dilute the vinegar.

Swap the onion

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

  1. Horseradishfits better
  2. Radishfits better
  3. Lettucefits better
  4. Onionthe original

Fit is the average pairing score against cucumber, mustard, pepper, cider, 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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