Cream butter and sugar until smooth. Work in the flour and rosemary to make soft dough; shape into a ball. Roll out on a floured surface until ¼ inch thick, cut into rounds with a 2” fluted cutter. Bake on a greased baking sheet in a 325° oven for 15 to 20 minutes or until the shortbread changes color. Cool on a wire rack and sprinkle with sugar. Makes about 12 cookies.