How to Make It
Preheat oven to 400°.
Pour the sweetened condensed milk into a 9-inch pie plate, and cover with foil. Place the pie plate in a shallow roasting pan. Add enough hot water to the pan to come halfway up the sides of the pie plate. Bake the milk at 400° for 1 1/2 hours, adding additional water as needed.
Remove the pie plate from the water. Uncover, and stir milk with a whisk until smooth.