This is very moist and light.

1 (18 1/2 ounce) box Duncan Hines Butter Cake Mix

Prepare cake according to directions on package, pouring batter into 3 prepared round pans. Bake as directed on package, but adjust time for three layers.

Filling
1 (20 ounce) can crushed pineapple in heavy syrup
1/4 cup granulated sugar
2 egg yolks
3 level tablespoons flour

Mix pineapple, egg yolks, flour and sugar. Place over medium heat and cook until thick, stirring constantly. Use filling between layers.

Icing
2 egg whites
1 1/2 cups granulated sugar
2 tablespoons white corn syrup
5 tablespoons water
1/8 teaspoon cream of tartar
1 teaspoon vanilla extract

Cook all ingredients in top of double boiler over boiling water. Mix with hand mixer until icing will stand in a peak. Ice top and sides of cake.