Heat oven to 425°F and adjust rack to middle. Pour the can of 1 (14-ounce) sweetened condensed milk into a 9-inch deep pie dish and cover tightly with foil. Set plate in a pan that it fits in and add enough hot water to pan to reach halfway up pie dish. Bake milk in middle of oven 45 minutes. Check water level and add additional, if its low, then continue to bake 45 minutes more, or until milk is thick and brown. Remove and stir. Allow to cool or cool slightly and add to food processor (optional) to get to desired texture. Makes about 1 1/2 to 2 cups.