c. ketchup

Ketchup (also catsup or tomato ketchup) is a fermented condiment made primarily from tomato paste, vinegar, sugar, and spices. Originating in China as a fermented fish sauce called "ke-tsiap," the condiment was adopted and transformed by English merchants in the 17th century, eventually evolving into the tomato-based version popularized in America during the 19th century. Modern ketchup is characterized by a smooth, pourable consistency, balanced sweet-sour-savory flavor profile, and deep red color derived from concentrated tomatoes. The ingredient typically contains garlic, onion, cloves, and allspice; regional and branded variations differ in sweetness levels, spice intensity, and the presence of additional ingredients such as molasses or mustard seeds.

Ketchup functions as a multipurpose condiment and flavor agent in contemporary global cuisine. It is commonly paired with fried foods—French fries, hamburgers, hot dogs—and used as a dipping sauce for appetizers. Beyond its traditional fast-food role, ketchup serves as a base ingredient in glazes, marinades, and sauces for grilled meats and vegetables, and is incorporated into soups, stews, and baked bean preparations. Regional applications include its use in British chip shop culture, as an accompaniment to Indian street food, and as a component in Heinz-inspired condiment combinations across North America.