Skip to main content
Main

Tomato Catsup

A homemade tomato ketchup made by boiling tomatoes, adding vinegar, salt, spices, and garlic, then reducing and bottling.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
Jump to recipe ↓

Why it works: Clove and allspice match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 7,874 recipes. Both carry estragole, which smells anise, licorice. The science ↓

Tomato Catsup

Ingredients

Directions

Make the ketchup

  1. Boil the tomatoes until soft.

  2. Squeeze the tomatoes through a fine wire sieve.

  3. Add vinegar, salt, cloves, allspice, cayenne pepper, and garlic to the tomato puree.

  4. Mix well and boil for about 3 hours, or until reduced by half.

Bottle

  1. Bottle the catsup without straining.

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. Clove + allspicetop 1% of all pairs
    Smell alikestrong
    Cooked together7,874 recipes

    Shared aroma: estragole (anise, licorice).

  2. Tomato + garlictop 3% of all pairs
    Smell alikemoderate
    Cooked together14,076 recipes

    Shared aroma: furaneol (caramel, strawberry).

  3. Clove + peppertop 5% of all pairs
    Smell alikestrong
    Cooked together17,451 recipes

    Shared aroma: ethyl octanoate (fruity, wine).

  4. Allspice + peppertop 5% of all pairs
    Smell alikestrong
    Cooked together6,395 recipes

    Shared aroma: estragole (anise, licorice).

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

Tomatoes
Provide the bulk, body and main flavor of the ketchup once cooked down.
Vinegar
Adds acidity that sharpens the flavor and helps preserve the ketchup.
Salt
Seasons the sauce and draws out flavor from the tomatoes.
Garlic
Adds pungent aroma and savory depth to the sauce.

The step that matters

Boiling down the puree. Long simmering evaporates water and concentrates the sugars and acids, thickening the sauce. Stopping too early leaves it thin and watery, while cooking too long can scorch the bottom and darken the flavor.

Swap the tomato

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

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

Fit is the average pairing score against vinegar, clove, allspice, pepper, garlic. 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.

More tomato ketchup recipes

Green 26 See all 523 →

You might also like

Tomato SoupTomato Soup526 recipesCream of Tomato SoupCream of Tomato Soup107 recipesTomato BisqueTomato Bisque61 recipesCream Tomato SoupCream Tomato Soup28 recipes