Shortbread base topped with lemon filling, baked and dusted with icing sugar.

Steps

1. Cut fat into flour, add icing sugar and pack into an ungreased 9 inch x 13 inch pan, like shortbread.
2. Beat eggs slightly; add sugar and lemon juice. Beat well, then fold in 2 tbsp flour and baking powder.
3. Spread on top of first mixture in pan. Bake at 350°F about 25 minutes.
4. Sift icing sugar over top when slightly cool. Cut in squares.