HP Sauce is a brown sauce originally produced by HP Foods in the United Kingdom, now produced by the H. J. Heinz Company in the Netherlands. It is named for the Houses of Parliament. It was the best-selling brand of brown sauce in the UK in 2005, with 73.8% of the retail market. HP Sauce has a malt vinegar base, blended with tomato, dates, tamarind extract, sweetener and spices.