Categories: Hamburger, Breads, Meats, Main dish 
      Yield: 4 servings 
  
      8 ea Hamburger Buns; * 
      1 x  Prepared Mustard Or Catsup 
      1 lb Lean Ground Beef 
    1/4 c  Onion; Chopped, 1 small 
      1 t  Salt 
    1/4 t  Pepper 
  
  *    Hamburger buns should be the small ones or use 6 slices of bread. 
  ~------------------------------------------------------------------------- 
  Heat oven to 500 degrees F.  Spread cut sides of hamburgers buns or one 
  side of each bread slice with mustard.  Mix meat, onion, salt and pepper. 
  Spread mixture over the mustard, being careful to bring it to the edges of 
  the buns.  Place meat sides up on an ungreased baking sheet.  Bake until 
  desired doneness is reached, about 5 minutes. 
  NOTE: 
  If you like, you can have these burgers ready and waiting in the freezer 
  for last-minute cooking.  After spreading the meat mixture over the buns, 
  wrap each securely in heavy-duty or double thickness of regular aluminum 
  foil and label; freeze no longer than 2 months.  To serve, unwrap desired 
  number of hamburgers and bake about 10 minutes.