Good-Cooking - Sweet Potato Cake

Ingredients

• 1 1/2 cups vegetable oil
• 2 cups granulated sugar
• 4 eggs, separated
• 4 tablespoons hot water
• 2 1/2 cups sifted cake flour
• 3 teaspoons baking powder
• 1 teaspoon ground cinnamon
• 1 teaspoon ground nutmeg
• 1/4 teaspoon salt
• 1 1/2 cups raw sweet potatoes, grated
• 1 cup nuts, chopped
• 1 teaspoon vanilla extract
• 1 (13 ounce) can evaporated milk
• 1 cup granulated sugar
• 1/2 cup margarine
• 3 egg yolks
• 1 1/3 cups flaked coconut