Chocolate Angel Food Cake

Description
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Ingredients

 * 1 1/4 cups granulated sugar
 * 1 cup all-purpose flour
 * 1/2 tsp. salt
 * 12 large egg whites, room temperature
 * 1 Tbs. fresh lemon juice
 * 3 tsp. vanilla extract
 * 1 Tbs. grated orange peel
 * 3 1/2 oz. dark chocolate-orange bars, such as Newman’s Own Organics Dark Chocolate-
 * Orange bars, grated

Directions
Preheat oven to 350°F. On sheet of waxed paper, sift 1/4 cup of sugar with flour and salt three times.

In large grease-free bowl, using an electric mixer at medium-high speed, beat egg whites until frothy. Add lemon juice and beat until soft peaks form. Evenly sprinkle remaining 1 cup sugar over whites, 1/4 cup at a time, and beat at medium speed 1 to 2 minutes. Sift 1/4 cup of flour mixture over whites and gently fold in using a rubber spatula. Add vanilla and orange peel. Alternately fold in remaining flour mixture and grated chocolate until well blended. (Be sure to fold gently to avoid deflating egg whites.)

Scrape batter into ungreased 10-inch angel food or tube pan. Bake until cake is lightly browned and knife inserted near center comes out clean, 40 to 45 minutes. Remove pan from oven and invert onto feet or over neck of a bottle. Let cool 30 to 45 minutes. Run knife around edges of pan and center of tube to remove.