Cut flour & 1/3 c. Powdered sugar with butter and press into greased 9" square pan. Bake at 350 for 15 minutes. Beat eggs til pale and thickened. Gradually beat in granulated sugar and continue beating until thick. Sir in lemon juice and pour over hot crust. Bake another 15 minutes until a pick inserted comes out clean. Sprinkle with remaining powdered sugar and let cool completely. Cut into 1" squares. Keep refrigerated (that is if there are any left after the horde gets to them).