Bake Betty Crocker angel food cake mix as directed on package. Cool. Cut cake into 3 layers. Fill layers with 1 jar (14 oz) cranberry-orange relish.
In chilled bowl, beat 1 1/2 cups chilled whipping cream and 1/3 cup confectioners' sugar until stiff. If you wish, tint cream mixture with few drops red food color. Frost side and top of cake. Chill several hours before serving.