hamburger is considered a national dish of the United States. In the United States and Canada, burgers may be classified as two main types: fast food hamburgers and individually prepared burgers made in homes and restaurants. The latter are often prepared with a variety of toppings, including lettuce, tomato, onion, and often sliced pickles (or pickle relish). French fries (or commonly Poutine in Canada) often accompany the burger. Cheese (usually processed cheese slices but often Cheddar, Swiss, pepper jack, or blue), either melted directly on the meat patty or crumbled on top, is generally an option. Condiments might be added to a hamburger or may be offered separately on the side, including ketchup, mustard, mayonnaise, relish, salad dressings and barbecue sauce. Other toppings can include bacon, avocado or guacamole, sliced sautéed mushrooms, cheese sauce, chili (usually without beans), fried egg, scrambled egg, feta cheese, blue cheese, salsa, pineapple, jalapeños and other kinds of chili peppers, anchovies, slices of ham or bologna, pastrami or teriyaki-seasoned beef, tartar sauce, french fries, onion rings or potato chips. Standard toppings on hamburgers may depend upon location, particularly at restaurants that are not national or regional franchises. Restaurants may offer hamburgers with multiple meat patties. The most common variants are double and triple hamburgers, but California-based burger chain In-N-Out once sold a sandwich with one hundred patties, called a "100x100." Pastrami burgers may be served in Salt Lake City, Utah. A patty melt consists of a patty, sautéed onions and cheese between two slices of rye bread. The sandwich is then buttered and fried. A slider is a very small square hamburger patty served on an equally small bun and usually sprinkled with diced onions. According to the earliest citations, the name originated aboard U.S. Navy ships due to how greasy burgers slid across the galley grill as the ship pitched and rolled. Other versions claim the term "slider" originated from the hamburgers served by flight line galleys at military airfields, which were so greasy they slid right through one, or because their small size allows them to "slide" right down the throat in one or two bites. In Alberta, Canada, a "kubie burger" is a hamburger made with a pressed Ukrainian sausage (kubasa). A butter burger, found commonly throughout Wisconsin and the upper midwest, is a normal burger with a pad of butter as a topping or a heavily buttered bun. It is the