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Catsup Without Spices

A homemade tomato ketchup made from ripe tomatoes, water, vinegar, brown sugar, salt, and black pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Tomato and pepper are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,923 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Catsup Without Spices

Ingredients

Directions

Prepare the tomatoes

  1. Wash and quarter the tomatoes without peeling them.

  2. Place the tomatoes and water in a pot over heat and cook until thoroughly heated.

  3. Pass the mixture through a fruit sieve.

Season and thicken

  1. Add vinegar, brown sugar, salt, and black pepper.

  2. Boil the mixture until it thickens.

Bottle

  1. Bottle and seal the catsup.

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. Tomato + peppertop 7% of all pairs
    Smell alikemoderate
    Cooked together17,923 recipes

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

  2. Vinegar + peppertop 14% of all pairs
    Smell alikemoderate
    Cooked together27,814 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  3. Vinegar + sugartop 15% of all pairs
    Smell alikemoderate
    Cooked together20,806 recipes

    Shared aroma: beta-damascenone (apple, rose).

  4. Tomato + vinegartop 16% of all pairs
    Smell alikemoderate
    Cooked together5,063 recipes

    Shared aroma: beta-damascenone (apple, rose).

  5. Sugar + peppertop 32% of all pairs
    Smell alikelow
    Cooked together19,401 recipes

    Shared aroma: 2-nonenal (fatty, green).

Sugar and pepper barely smell alike, yet cooks put them together in 19,401 recipes: they work on texture and structure more than aroma.

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

What each ingredient does

Tomatoes
Provide the bulk of the pulp, flavor, and natural pectin that gives the sauce its body.
Vinegar
Adds acidity that sharpens the flavor and helps preserve the finished sauce.
Brown sugar
Adds sweetness that balances the acidity and contributes to the thick, glossy texture.

The step that matters

Boil the mixture until it thickens. Cooking down the sauce evaporates water and concentrates the solids, so it sets to the right consistency. Stopping too early leaves it thin and watery, while overcooking can scorch the sugars on the bottom of the pot.

Swap the tomato

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

  1. Capsicumfits better
  2. Mustardfits better
  3. Cabbagefits better
  4. Tomatothe original

Fit is the average pairing score against vinegar, sugar, 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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