Make 8 equal size large patties. Sprinkle lightly with salt and pepper. Put 1/4 cup stuffing cubes in the center of 4 patties. Top each with one more patty and seal the edges. Place in baking pan and sprinkle with mushrooms. Mix 2 cups cold water with the dry gravy mix and pour over the patties. Cover and bake at 350 deg. F. for 45 minutes to an hour.