Overview

Ketchup is a sweet-and-tangy condiment made from tomatoes, vinegar, sugar or high-fructose corn syrup, and a blend of seasonings including onions, allspice, cloves, cinnamon, garlic, and celery. It is a core pantry item in American and global fast-food culture, most commonly paired with french fries, hamburgers, and sandwiches. The product is a processed sauce, not a whole food, and its modern form is a 20th-century American standardization of earlier fermented fish and fruit sauces.

Origin and history

Ketchup’s ancestry traces to fermented fish sauces from Southeast Asia, likely the Hokkien Chinese kê-tsiap, a brine of pickled fish and spices that arrived in the Malay Archipelago and then to European traders in the 17th century [1]. British cookbooks from the 1700s recorded “ketchup” as a thin, dark sauce made from mushrooms, walnuts, or oysters, not tomatoes. Tomato-based ketchup emerged in the early 19th century in the United States, where recipes for “tomato catsup” appeared in cookbooks by the 1830s. The thick, sweet, shelf-stable version familiar today was commercialized by the Heinz company beginning in 1876, and by the early 20th century, industrial production had displaced homemade and small-batch variants [1]. The spelling “ketchup” is now standard in American English, while “catsup” persists as a historical variant.

Varieties and aliases

  • Tomato ketchup (standard American-style)
  • Banana ketchup (Filipino variant, see Cross-cuisine context)
  • Mushroom ketchup (historical British variant, still produced by some specialty brands)
  • Walnut ketchup (historical British variant, rare today)
  • Curry ketchup (German variant, popular with currywurst)

Culinary uses

Ketchup is used primarily as a table condiment for dipping and topping. Its most common applications are with french fries, hamburgers, hot dogs, and fried foods. In home cooking, it appears as a base for barbecue sauces, cocktail sauce, and meatloaf glazes.

Cross-cuisine context

Ketchup has no direct analogue in traditional Mexican cuisine, where tomato-based salsas are fresh, cooked, or fermented but not sweetened and thickened with sugar and vinegar. The closest Mexican parallel is salsa roja cocida (cooked red salsa), which shares tomatoes and sometimes vinegar but lacks the sugar and spice profile of ketchup.

The most significant cross-cuisine analogue is Filipino banana ketchup, invented by food scientist Maria Ylagan Orosa during World War II when tomato imports were unavailable [2][3]. Made from mashed bananas (typically saba variety), vinegar, sugar, and red food coloring, banana ketchup mimics the color and tang of tomato ketchup while tasting distinctly fruity and clove-like. It is a distinct condiment with its own culinary logic and is not a substitute for tomato ketchup in most applications.

Notes for cooks

  • Ketchup is high in sugar and vinegar, making it a poor substitute for fresh tomato sauces in recipes that require acidity without sweetness. For Mexican salsas, use cooked tomato with vinegar and salt instead.
  • Banana ketchup is available in Filipino grocery stores and some Asian markets. It is sweeter and less acidic than tomato ketchup, with a noticeable clove and banana aroma. Do not substitute one for the other without adjusting the recipe.
  • Opened ketchup should be refrigerated. The vinegar and sugar content give it a long shelf life, but flavor degrades over time.