Hamburgers are one of those foods that apparently vary depending on geographical location. Here, if you order a hamburger all the way, it will typically come with lettuce, tomatoes, dill pickles, mustard, onions, and mayonnaise. Back about 25 years ago when I'd spend a month or so working in North Dakota I discovered that the same wasn't true everywhere the first time I ordered a hamburger and it came with ketchup and no mayonnaise. Some of the places there, or on the way there, wouldn't even have mayonnaise if I asked for it.