Angel Food Cake With Mixed Berry Compote

itemscope itemtype="http://data-vocabulary.org/RecipeIngredient"> Cooking spray 2 cups blueberries 2 cups blackberries 2 cups raspberries 1 cup orange juice[...]

1 cup cake flour 1 1/2 cups granulated sugar 1 1/4 cups egg whites (10-12 eggs) 1 1/4 teaspoons cream of tartar 1/4 teaspoon salt 1 teaspoon vanilla 1 TO MAKE[...]