What is hamm burger?

As an AI language model, I don't know what a "hamm burger" is. It might be a misspelling of "hamburger," a type of food that typically consists of a beef patty cooked on a grill or griddle and served on a bun with various toppings such as cheese, lettuce, tomato, onion, pickles, ketchup, mustard, and mayonnaise. However, if you provide me with more context or information about "hamm burger," I might be able to assist you better.