The Filet-O-Fish (also FishMac, MacFish or McFish) (introduced in 1962 and reached nationwide status in the United States in 1965) is a fish sandwich sold by the international fast food chain store McDonald's. The Filet-O-Fish contains a battered fish patty made mostly from Alaskan pollock and/or hoki, half a slice of processed cheese and 30ml of tartar sauce. Currently in the UK, however, new operational procedures in practice have reduced the amount of sauce to 20ml of tartar sauce and Fillets are no longer salted. The tartar sauce is made with dill relish and seasoning on a steamed bun. It is similar to the English favourite, the fish finger sandwich.