A.1.

A.1. Sauce (formerly A.1. Steak Sauce and sometimes stylised as A1 Sauce in certain markets) is a brand of brown sauce produced by Brand & co, a subsidiary of Premier Foods in the United Kingdom (as "Brand's A.1. Sauce") and in North America by Kraft Heinz. Created in London, it was sold from 1831 as a condiment for "fish, meat, fowl and game" dishes in the United Kingdom. The makers introduced the product to Canada, and later to the U.S. where it was later marketed as a steak sauce.