catsup

Catsup, sometimes spelled ketchup, is a thick, tangy condiment most commonly made from tomatoes. It is used as a versatile accompaniment for a wide range of foods, including French fries, burgers, hot dogs, and grilled meats. A typical tomato catsup blends tomato puree or concentrate with sugar, vinegar, salt, and various spices or flavorings; onions, celery, garlic, or allspice are common additions. Commercial products may also include preservatives, stabilizers, or colorants to improve shelf life and consistency.

Origin and historical notes: The word katsup/catsup derives from the Malay kecap, via Indonesian sauces. Early English and American varieties included fermented fish or mushroom-based condiments labeled as ketchup or catsup. Tomato-based catsup emerged in the United States in the 19th century, and by the late 1800s manufacturers such as Heinz popularized a tomato version. The spelling gradually shifted toward ketchup in modern usage, though catsup persists on some brands and in regional or historical contexts.

Variants and usage: Although tomato ketchup dominates today, catsup can refer to non-tomato sauces such as mushroom catsup in traditional English cuisine. In many markets, ketchup is the predominant spelling; however, both spellings appear on older labels and in some regional expressions. After opening, most tomato ketchup is refrigerated to maintain quality.