Chocolate Waffles

Makes 8 servings.. Preheat waffle iron. Preheat oven to 200 degrees. Sift flour, cocoa, baking powder, soda and salt into a mixing bowl. In a medium bowl, whisk egg yolk, buttermilk, brown sugar, oil, vanilla and coffee granules. Whisk into dry ingredients until just moistened. In a clean mixing bowl, beat egg whites with an electric mixer until soft peaks form. Gradually add granulated sugar, beating until glossy but not dry. Whisk one-quarter of the beaten whites into the batter, then fold in remaining whites. Lightly coat waffle iron with nonstick spray. Spoon in batter and cook until waffle is crisp and golden. Transfer to oven to keep warm. Repeat with remaining batter, lightly coating iron with nonstick spray each time, if necessary. Spoon Dark Chocolate Sauce over waffles. Dust with powdered sugar. Dark Chocolate Sauce In a large, heavy saucepan, whisk 1 cup packed light-brown sugar and 2/3 cup unsweetened cocoa powder. Gradually whisk in 1 1/2 cups of 1 percent milk until a smooth paste forms. Bring to a simmer, whisking constantly. Reduce heat to low and simmer, whisking constantly, 4 minutes. Remove from heat and add 2 ounces chopped bittersweet or semisweet chocolate ; stir until melted. Stir in 1 teaspoon vanilla extract. Let cool slightly; serve warm. Sauce will keep, covered, in refrigerator up to 2 days. Makes about 2 cups.