We need more info on this sauce. We’re not hip to the abbreviation
From Wikipedia: "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 was named after London's Houses of Parliament. Since its first appearance on British dinner tables, HP Sauce has become an icon of British culture." Ingredients described as: "HP Sauce has a tomato base, blended with malt vinegar and spirit vinegar, sugars (molasses, glucose-fructose syrup, sugar), dates, cornflour, rye flour, salt, spices and tamarind. It is used as a condiment with hot and cold savoury food, and as an ingredient in soups and stews"
Made by Heinz out of the Netherlands.