DIRECTIONS
In a skillet, saute onion in butter. Transfer to bowl; add meat, egg and seasonings. Spread over bottom halves of the rolls; replace tops. Place on baking sheets; cover with foil. Bake at 350° for 20 minutes. If desired, place a cheese square and pickle on each hamburger; replace tops and foil and return to the oven for 5 minutes. Yield: 40 servings.