Cream the fat and sugar and beat in the egg. Sift flour with cinnamon, or add grated rind, and add to the creamed fat mixture. Mix to a stiff consistency, using milk if required. Roll out fairly thinly and cut out with a 2½-in. cutter. Place on a greased baking- sheet and bake in a moderate oven (350° F., Gas 4) till light fawn colour.