Fresh Lemon Filling

Directions

1. 1
   In 1-quart saucepan, stir sugar, lemon peel and juice, cornstarch, salt and 1/2 cup water, until blended.
2. 2
   Over medium heat, cook until mixture is very thick and boils briskly, stirring constantly.
3. 3
   Remove from heat and stir in butter.
4. 4
   Cool at room temperature.
5. 5
   (If mixture becomes too thick, stir until of spreading consistency.)
6. 6
   Fills 2 cakes.