As promised, here is my recipe for making Japanese style hamburgers or hamburger steaks, one of the quintessential _yohshoku_ or Japanese Western-style dishes.
They are called hanbaagu (though they are sometimes called hambaagaa, but that variation usually refers to the kind that comes sandwiched inside a bun) in Japan, and are very popular for lunch or dinner, and are eaten as a side dish to rice (okazu) in Japanese homes. In fancier restaurants that specialize in yohshoku, they might be eaten with a knife and fork, but at home they're eaten with chopsticks. Whenever Japanese food magazines have a poll about popular okazu, hamburgers are always in the top three, especially amongst kids.
They don't have much in common with the American style of hamburger, except for the fact that they both start off with ground meat. A Japanese hamburger has more in common with meatloaf, and a rather similar texture. They are similar to the old TV dinner standby, Salisbury steak, but I think a lot better.