Combine ham, ground beef, eggs, graham cracker crumbs, 7-Up and powdered onion; mix well.
Form into balls using either a 1/4 cup size measuring cup or 1/2 cup size. The 1/4 cup will yield 50 balls and 1/2 cup will yield 25 balls. Place in 11x15-inch or 9x13-inch shallow baking pans.
Combine sauce ingredients and mix well. Pour over ham balls and bake at 350 degrees for 1 hour.