Hamburger 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 mustard, mayonnaise, ketchup, 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,
History of the hamburger the employees to improve the sale of the burgers with a simple idea: to be able to prepare burgers rapidly so anyone could purchase and eat them anytime and anywhere. Instead of waiting for half an hour to be served at a traditional restaurant, the White Castle System provided rapid service and a menu centered around the hamburger. At the time, the hamburger was typically served with coffee. Upton Sinclair's "The Jungle" had already caused public outrage over the safety of processed meat, so by the 1920s, the general public had come to expect a clean and hygienic hamburger. In