Lemon Jelly Cake

1 box Duncan Hines? Butter Recipe Cake Mix
8 egg yolks, slightly beaten
1 1/2 cups granulated sugar
8 tablespoons lemon juice
1/2 cup butter (no substitute)

Prepare cake mix as directed in two 8-inch pans. Let cool and set aside.

Mix egg yolks, sugar, lemon juice and butter together in a saucepan. Cook mixture over low heat, stirring constantly, until it comes to a boil and thickens. If mixture becomes lumpy, strain. Put mixture in bowl and set in refrigerator until cold.

Slice cake to make 4 layers and put lemon mixture between layers and on top of cake.