Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      cup           catsup
   1      tablespoon    lemon juice
   1      teaspoon      prepared mustard
     1/8  teaspoon      pepper
   4                    hamburger buns -- split
   2      tablespoons   brown sugar
   1      tablespoon    worcestershire sauce
     1/2  teaspoon      onion salt
   8      ounces        cooked roast beef *

Preparation:

* Roast Beef should be thinly sliced and there should be 8 to 10 slices. Mix catsup, brown sugar, lemon juice, worcestershire sauce, mustard, onion salt, and pepper in 2-cup glass measure. Microwave uncovered on high (100%) 1 1/2 minutes; stir. Microwave to boiling, 1 to 2 minutes. Layer half the beef slices and half the sauce in 1-Qt casserole; repeat. Cover and microwave on high (100%) until hot and bubbly, 1 1/2 to 2 1/2 minutes. Place bottom halves of buns on serving plate. Top with beef and reamining bun halves. Microwave uncovered on high (100%) until buns are hot, 30 seconds to 1 minute.