Put milk to boil with sugar. Once the boil, gradually pour semolina and half a packet butter. Stir until it thickens and becomes a thick, soft cream. Flavored with vanilla and lemon rind and cool a bit, add the egg yolks and mix. Arrange in a tray half wafers spread with butter, so to come out a little from the tray. Pour the cream on top arrange the remaining peel and wrap the ends inward. Brush the top with a little water and bake the banitsa in a moderate oven. Remove it, cool it and pour hot syrup boiled water and sugar.