1 yellow cake mix
3/4 c. sugar
3 tbsp. cornstarch
1/4 tsp. salt
3/4 c. water
1 tsp. grated lemon rind
1 tbsp. butter
1/3 c. lemon juice
2 drops yellow food coloring
Vanilla frosting

Prepare cake mix for 2 (9 inch) cake layers. Cool 15 minutes. Mix sugar, cornstarch and salt in saucepan. Stir in water. Cook. Stir until thickened and let boil. Remove from heat. Stir in butter, lemon peels, and let melt. Stir in lemon juice and food coloring. Press plastic wrap onto filling. Refrigerate 2 hours. Fill layer and top with filling. Frost sides with vanilla frosting.