1/2 teaspoon seasoned meat tenderizer
salt and pepper to taste
2 teaspoons butter
2 (4 ounce) cans sliced mushrooms, drained
2 tablespoons soy sauce
4 slices Swiss cheese
6 hamburger buns
Prepare a grill for medium heat. Lightly oil the grate. Divide the ground beef into 6 patties. Season with meat tenderizer, salt and pepper. Set aside. Melt the butter in a skillet over medium heat. Add the mushrooms and soy sauce; cook and stir until browned. Set aside and keep warm. Grill the patties for about 6 minutes per side, or until cooked through. Divide the mushroom mixture evenly amongst the burgers and top each one with a slice of Swiss cheese. Cover the grill for about 1 minute to allow the cheese to melt. Remove from the grill and serve on hamburger buns.