Hamburger Salad Sandwiches

1/4 pound hamburger
1 tablespoon chopped onion
1 cup shredded lettuce
1/2 cup shredded cheese
1 large dill pickle, chopped
1/2 cup mayonnaise
1 hardboiled egg, chopped (optional)
1 teaspoon salt
1/4 teaspoon pepper

Brown hamburger with salt and pepper. Drain and cool slightly. Add all other ingredients and stir well. Use for regular bread sandwiches or as a pita filling.