Blueberries, sliced peaches, strawberries and kiwifruit
Drain oranges, reserving juice in a 2-cup measuring cup; add enough orange juice to measure 1-3/4 cups. Set aside. Finely chop oranges; drain well and set aside.
Prepare cake batter according to package directions; add the orange extract and food coloring if desired with the water. Fold in the chopped oranges. Pour into an ungreased 10-in. tube pan. Bake according to package directions.
In a small saucepan, combine the cornstarch and cold water until smooth. Gradually add the reserved orange juice mixture. Bring to a boil; cook and stir for 2 minutes or until slightly thickened. Cool to room temperature. Slice cake; serve with fruit and orange sauce.