HP Sauce is a British brown sauce, the main ingredients of which are tomatoes, malt vinegar and molasses. It was named after London's Houses of Parliament. After making its first appearance on British dinner tables in the late 19th century, HP Sauce went on to become an icon of British culture, and it is now the best-selling brand of brown sauce in the UK. The sauce was originally produced in the United Kingdom, but is now made by Heinz in the Netherlands.
HP Sauce has a tomato base, blended with malt vinegar and spirit vinegar, sugars (molasses, high-fructose corn syrup, sugar), dates, cornflour, rye flour, salt, spices and tamarind. It is used as a condiment with hot and cold savory food, and as an ingredient in soups and stews.