Hamburger patties" to distinguish them from inexpensive hamburgers made with cost-savers like added flour, textured vegetable protein, ammonia treated defatted beef trimmings (which the company Beef Products Inc, calls "lean finely textured beef"), advanced meat recovery, or other fillers. In the 1930s ground liver was sometimes added. Some cooks prepare their patties with binders like eggs or breadcrumbs. Seasonings may include salt and pepper and others like as parsley, onions, soy sauce, Thousand Island dressing, onion soup mix, or Worcestershire sauce. Many name brand seasoned salt products are also used. Raw hamburger may contain harmful bacteria that can produce food-borne illness
History of the hamburger variations on the burger adapted to the Asian world, including the teriyaki burger, takumi burger, and riceburger. In Hong Kong, Aji Ichiban competed with large chains before it spread quickly throughout Asia. One of the first hamburger vending machines debuted in Amsterdam in 1941 under the brand "FEBO", its name derived from its original place of creation, the Ferdinand Bolstraat. At the same time the hamburger was growing in popularity around the world, it took on a variety of local features in different locations. Such examples of this include ground meat made from local animals, such as kangaroos in Australia,