Tomato paste is a concentrated form of tomatoes used in cooking to enhance the flavor of sauces, soups, and stews. It is made by cooking tomatoes for an extended period, removing skin and seeds, and reducing the remaining pulp into a thick paste. It is commonly used in pasta sauces, pizza sauce, marinades, stews, braises, tomato broth, and as a thickening agent. To use tomato paste, scoop desired amounts from cans or tubes and store the remaining paste in an airtight container in the refrigerator.