cup ketchup

Ketchup (also spelled catsup) is a sweetened tomato-based condiment derived from the Chinese fermented fish sauce known as ke-tsiap. The modern American version, standardized in the 19th century, is produced by cooking down tomato paste, vinegar, sugar, and spices into a thick, pourable sauce. The ingredient achieves its characteristic deep red color, slightly acidic flavor profile with sweet and savory notes, and smooth texture through careful reduction and emulsification. Commercial ketchup typically contains tomato solids (concentrated tomato paste), vinegar, high fructose corn syrup or sugar, salt, and spice infusions including onion, garlic, clove, and allspice. Homemade varieties may vary in sweetness and spice intensity based on regional preferences and family traditions.

The sauce originated in Asia but was transformed into a distinctly American condiment during the late 1800s, with Heinz establishing the archetypal formula in 1876. Standard ketchup maintains a pH below 3.9 for food safety and shelf stability.

Ketchup functions as a versatile table condiment and cooking ingredient across North American and increasingly global cuisines. It is most commonly paired with fried potatoes, hamburgers, hot dogs, and other casual foods as a finishing condiment. In cooking, ketchup serves as a flavor base for barbecue sauces, glazes for grilled meats, and additions to soups, stews, and braised dishes. Its sweetness and acidity make it suitable for balancing savory dishes, particularly in fusion cooking and casual American fare. Ketchup is also used in marinades, dipping sauces, and as a component in condiment combinations like Thousand Island dressing. Some cuisines, particularly in Asia and Europe, incorporate ketchup into cooked dishes, though it remains primarily a condiment in traditional American usage.