Lemon Filling

4 large eggs
2 cups granulated sugar
1/3 cup flour
6 tbs. lemon juice concentrate
1 tsp. grated lemon zest

1. Combine the sugar and eggs and beat in a large bowl until it is thick and light colored.
2. Then beat in the remainder of the ingredients.

Note: This filling should be poured over a partially baked crust and then baked until it is set and firm to the touch.