Double-layered Biscuits

Ingredients

 * 100g/4oz butter
 * 225g/8oz Sugar
 * 1 egg
 * 2 egg Yolks
 * 1 teasp vanilla extract
 * 2 teasp Grated lemon Rind
 * 150g/+5oz cornflour
 * 50g/2oz plain flour
 * 1 teasp baking powder
 * 1/4 teasp salt

Directions

 * 1) Preheat the oven to 180C, 350F, Gas Mark 4 and well butter 2 baking trays.
 * 2) In a large mixing bowl, cream together the butter and Sugar and beat until pale and fluffy.
 * 3) Add the vanilla extract, egg  and egg yolks, one at a time, beating well between each addition.
 * 4) In another bowl, mix together the lemon rind, cornstarch, flour, baking powder and salt then add to the egg mixture and beat well to thoroughly combine.
 * 5) Drop small spoonfuls of the mixture onto the prepared baking trays, spacing well apart, then bake for 15 minutes.
 * 6) Cool on wire trays then sandwich the biscuits together with (dulce de leche)  Jam milk.