Use your imagination to jazz up a classic hamburger any way you want. For an Asian twist, omit the Worcestershire sauce and salt, add a dash of soy sauce, and use chopped green onion instead of yellow onion. For a French-style hamburger, omit the Worcestershire sauce, halve the salt, and add 1 Tbs. each of crumbled blue cheese and chopped mushrooms along with a dash of red wine. For a Provencal flavor, omit the Worcestershire sauce, double the garlic, and add 1 Tbs. each of chopped dried tomatoes and pitted black olives. Vary the garnishes along with the seasonings. For health reasons, all ground meat should be cooked at least to the medium-well stage.