National Hamburger Day is observed each year on May 28. This day celebrates a summer-time grilling favorite and National Hamburger Day is part of National Hamburger Month.
Hamburger. Seasoned ground beef, grilled and placed between two slices of bread or a bun. Top with sauteed onions, peppers, pickles, sliced onions, or cheese. Add condiments such as ketchup, mustard or mayo. Any one of these combinations would create a modern American version a hamburger.
It is most likely that the hamburger sandwich first appeared in the 19th or early 20th centuries, but there is much controversy over its origin. Over the years, the hamburger has become a culinary icon in the United States.