Lemon squares

 In a bowl, mix the pastry ingredients - first the all-purpose flour with the icing sugar and lemon zests and then add the butter, which is better if melted.

Put the mixture in an square baking-pan and bake it for about 25-30 minutes at 170 degrees.

In the meanwhile, prepare the lemon cream beating the eggs with sugar and then adding lemon juice and flour.

Turn down the oven to 140 degrees and pour the lemon cream mixture over the pastry layer, baking it for about 40-45 minutes at 140 degrees.

When it is cold, slice it into little squares and keep them in the fridge before serving