All Day Pie

Take labels off the sweetened condensed milk and place unopened in a Dutch oven (a big pot with a lid).

Fill almost full with water and boil cans slowly for 3 hours, uncovered. As the water evaporates, keep adding more hot water so the cans remain covered the entire time. After 3 hours, carefully remove from water and put them in the refrigerator to cool. Open cans and slide out of can. Set aside.