Preheat oven to 350° F.
Blend together well and press into a buttered 9 x 13 inch pan:
1 cup butter, softened
½ cup powdered sugar
2 cups sifted flour
¼ tsp. salt
Bake 20 minutes.
Beat:
4 eggs
Add to eggs and blend until smooth:
2 cups white sugar
¼ cup sifted flour
1 tsp. grated lemon rind
4 tsp. lemon juice
Pour over baked ingredients. Bake 25 minutes.
Sprinkle powdered sugar on top and cut into squares.