This flan—Spanish baked custard—is best when made with leftover sweet potatoes that have been simply prepared and minimally seasoned. Use ground nutmeg in place of grated whole nutmeg, if you prefer. Kitchen Tip: Do not stir the sugar and water mixture during cooking because this causes the sugar to seize, or crystallize, which will make it difficult to pour.
1/2 teaspoon canola oil
1/2 cup granulated sugar
1 tablespoon water
1 cup leftover mashed sweet potato
1/2 cup packed brown sugar
2 tablespoons white rum
2 tablespoons butter, melted
1/4 teaspoon ground cinnamon
1/8 teaspoon salt
1/8 teaspoon grated whole nutmeg
3 large eggs
1 1/2 cups 1% low-fat milk
How to Make It
Preheat oven to 325°.
Coat an 8-inch metal cake pan with high sides with canola oil, tipping to fully coat.
Combine granulated sugar and water in a small heavy saucepan over medium-high heat; cook for 5 minutes or until golden. Immediately pour into prepared pan, tipping quickly until caramelized sugar coats bottom of pan.
Place sweet potato and next 7 ingredients (through eggs) in a blender; process until smooth. Add milk; process just until blended. Pour mixture over caramel in pan. Place pan in a 13 x 9-inch glass or ceramic baking dish; add hot water to dish to a depth of 1 inch.
Bake at 325° for 1 hour or until a knife inserted in center comes out clean. Remove pan from water. Cool completely on a wire rack. Cover and chill for 8 hours or overnight. Invert flan onto a platter, and cut into 8 wedges. Drizzle any remaining caramel syrup over flan.