Grease and flour baking sheets. Beat egg yolks, powdered sugar and salt in a large bowl until pale and creamy. Beat egg whites until very stiff; fold into egg yolk mixture. Siftflour, baking powder and aniseed onto egg mixture; fold in quickly but thoroughly. Fill a pastry bag fitted with a plain nozzle with cookie mixture. Pipe in small rounds onto prepared baking sheets. Let stand overnight to dry out. Preheat oven to 325'. Bake cookies 20 minutes. Cool on rack. ----