Good-Cooking - 1870 Wedgewood Inn Kahlua Flourless Fudge Cake

Ingredients

• 7 extra large egg whites
• 1 cup granulated sugar
• 1/2 pound unsalted butter, cut into small pieces
• 1/2 pound European bittersweet chocolate, broken into small pieces
• 1 tablespoon pure vanilla extract
• 1 tablespoon espresso
• 3 tablespoons Kahlua