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,
Rudolf Hamburger with the International Congresses of Modern Architecture. With the help of Syrkus, Rudolf Hamburger entered into a form of architectural partnership with a Warsaw architect called Spiwall. The partnership concentrated on residential houses and villas. Hamburger's residence permit did not permit him to earn money in Poland. Some sort of financial arrangement with Spiwall was nevertheless devised, and Hamburger did most of his partnership work from home. However, a succession of "conspiratively arranged" changes of address made it increasingly hard for Hamburger to work in the city. He did draw up plans for a substantial ten dwellings unit for his