Instructions

1. 1
   Combine flour and sugar in a medium mixing bowl.
2. 2
   Cut in margarine until mixture resembles fine crumbs.
3. 3
   Press firmly into a greased square (8 x 8 or 9 x 9-inch) pan.
4. 4
   Bake at 350°F (180°C) for about 20–30 minutes, until lightly browned. Prepare the topping in the meantime.
5. 5
   Beat eggs in large mixing bowl until frothy. Stir in the lemon juice and rind.
6. 6
   In another bowl, stir together the sugar, flour, and baking powder.
7. 7
   Add dry mixture to wet mixture. Stir until just moistened.
8. 8
   Spread evenly over the hot base, and return to oven to bake for 20–25 minutes, or until set.
9. 9
   Let squares cool before removing from pan and cutting. Dust with powdered sugar.