Rhubarb-Orange Angel Food Torte

Directions

1. Prepare cake and bake cake according to package directions, using a 10-in. ungreased tube pan. Immediately invert pan onto a wire rack; cool completely, about 1 hour. Run a knife around sides of cake and remove from pan.
2. Meanwhile, in a small saucepan, combine the rhubarb, raspberries, sugar, 4 tablespoons orange juice, orange zest and ginger. Cook, uncovered, over medium heat about 7 minutes or until rhubarb is tender.
3. In a small bowl, combine cornstarch and remaining orange juice until smooth; gradually stir into the fruit mixture. Bring to a boil; cook and stir for 2 minutes or until thickened. Remove from the heat; cool completely.
4. Split cake into three horizontal layers. Place the bottom layer on a serving plate; spread half of the rhubarb mixture to within 1/2 in. of edges; repeat layer. Top with the third layer. Frost top and sides with whipped topping. Garnish with raspberries if desired. Refrigerate leftovers.