Calico Egg Sandwich

4 Hard boiled eggs, coarsely chopped 3/4 Cup diced, cooked ham 1/2 Cup shredded cheddar cheese 1/4 Cup chopped celery 1/4 Cup mayonnaise 2 Tablespoons finely chopped onion 1/2 Teaspoon dry mustard 1/2 Teaspoon salt 1/4 Teaspoon pepper 4 Kaiser rolls, halved & buttered Combine all the ingredients; mix well. Spoon onto rolls, open face style. Put on a cookie sheet or other flat baking dish. Bake at 400F, 15 minutes or until the cheese melts and the tops of sandwiches look a little toasty.