Mix ingredients for crust and press into an 8 x 8 inch pan.
Bake at 350°F. for 20 minutes.
Mix ingredients for filling.
Pour on crust and bake 20-25 minutes or until set.
Sprinkle with confectioner's sugar and cut into squares.
This recipe is easily doubled. Note: To prepare lemon zest, you can use a zester or a knife beingmcareful not to get the white part. The white part is bitter.