Heat tortillas one at a time in hot, dry skillet, turning from one side to the other until soft but not crisp. After heating one, place a dollop of butter in center and stack another hot tortilla on top. Place stack of tortillas in covered casserole to keep them warm and soft. Otherwise they dry out. To eat, you can cut in wedges like a pie, or pick up individual tortillas and roll them, which is the more traditional way of eating them.