History of the hamburger in the United States is found in Japan, but is a local variation. History of the hamburger in the United States A hamburger (or burger) is a sandwich that consists of a cooked ground meat patty, usually beef, placed between halves of a sliced bun or between slices of bread or toast. Hamburgers are often served with various condiments, such as mustard, mayonnaise, and ketchup, and other options including lettuce, tomato, onion, pickles, and cheese. The Texas historian Frank X. Tolbert attributes the invention of the hamburger to Fletcher Davis of Athens, Texas. Davis is believed to have sold hamburgers at his café at
Cao Hamburger Went on Vacation"), partly based on his childhood memories. Hamburger was also one of two creative directors for Rio's contribution to the 2012 Summer Olympics opening ceremony. Cao is the son of physicists and University of São Paulo professors Ernst Wolfgang Hamburger, of Jewish-German origin, and Amélia Imperio Hamburger, of Italian origin. He has three sisters: Sonia, a film producer, Vera, an art director and Esther, a university professor. His brother Fernando is a photographer. Cao Hamburger Carlos Império Hamburger, better known as Cao Hamburger (; born 1962 in São Paulo), is a Brazilian screenwriter and director of movies and