Use 1/4 lb, 90% to 93% lean ground beef, a 1 qt freezer bag and press them flat. Work from the bottom up to force out the air. Freeze flat and cut the bag open when ready to cook. Do not thaw or you'll never get it out of the bag without destroying it. Cooks in only a few minutes with a griddle on medium heat. Cheaper and you know what's in them!