Beat eggs until light. Stir in sugar and beat well. Add extract, rind and flour sifted with baking powder. Mix will. Chill 1 hour. Roll out ONE HALF INCH thick on floured board. Roll springerle pin over dough, or press mold into top, flouring pin or mold each time. Pam also helps. Expose to air overnight. Cut cookies apart and arrange on baking sheet. Bake at 180ºC or about 30 minutes. Do not overbrown. Not everyone likes the licorice flavor of anise, so orange, lemon, or vanilla may be substituted if desired. Store cookies in covered container with apple slices for 10 days before serving.