1 can sweetened condensed milk
1 box graham crackers

REMOVE PAPER FROM CAN. Cover can completely with water in charge saucepan. Boil gently for 3 hours, always keeping can covered with water. Cool can and open; the milk turns into caramel. Unwrap crackers from inner paper and spread caramel between each layer of crackers. There should be 3 blocks of crackers as they come from box. Refrigerate after rewrapping. Slice and serve.