In food processor, place raspberries. Cover; process until smooth. If desired, strain to remove seeds. In 1-quart saucepan, mix pureed raspberries, 2 tablespoons sugar and the cornstarch. Heat to boiling over medium heat, stirring constantly. Refrigerate sauce 30 minutes to cool. Stir fresh raspberries into sauce. Before cutting cheesecake, carefully remove side of pan. Serve sauce over wedges of cheesecake. Store cheesecake covered in refrigerator.