Hamburger such as , due to the occasional initial improper preparation of the meat, so caution is needed during handling and cooking. Because of the potential for food-borne illness, the USDA recommends hamburgers be cooked to an internal temperature of . If cooked to this temperature, they are considered well-done. Burgers can also be made with patties made from ingredients other than beef. For example, a "turkey burger" uses ground turkey meat, a "chicken burger" uses ground chicken meat. A "buffalo burger" uses ground meat from a bison, and an "ostrich burger" is made from ground seasoned ostrich meat. A deer
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