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Tomato Paste

A thick tomato paste made by cooking tomato pulp with spices and sweet red 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 ↓

Tomato Paste

Ingredients

Directions

Make the paste

  1. Cook the spices tied in a bag with the tomato pulp in a pan over boiling water for about three hours.

  2. Continue cooking until the paste is thick enough to hold the shape of a spoon when tested.

Jar and process

  1. Pack the hot paste into small jars.

  2. Process the jars in a water bath for 15 minutes at 212°F (100°C).

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. Tomato + oniontop 8% of all pairs
    Smell alikemoderate
    Cooked together20,633 recipes

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

  3. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

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

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

  5. Tomato + sugartop 33% of all pairs
    Smell alikelow
    Cooked together4,667 recipes

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

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

Tomato pulp
Forms the bulk of the paste, and long cooking thickens it by evaporating its water.
Sweet red pepper
Adds sweetness and body to the paste as it cooks down.
Sugar
Adds sweetness and balances the tomato's acidity.

The step that matters

Cooking until thick enough to hold a spoon's shape. Tomato paste thickens only as water evaporates during long, gentle cooking. Stopping too early leaves a loose paste that may not set or keep well, while cooking too hard can scorch the sugars and pulp on the pan.

Swap the onion

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

  1. Capsicumfits better
  2. Carrotfits better
  3. Okrafits better
  4. Onionthe original

Fit is the average pairing score against tomato, 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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