Oven at 325 degrees.
1 c. butter
2 c. flour
1/2 c. powdered sugar
Press into a greased 12" x 8" pan; bake 20 min.
2 c. sugar
4 T. flour
1/4 c. lemon juice (I use more)
2 T. grated lemon peel (I use more)
Beat until very foamy, pour on top, bake 20 more min. (I go a little longer to make sure it's doesn't end up too goopy), sprinkle w/ powdered sugar, cut while still hot (especially loosening edge). it makes that nice crispy surface all by itself!