Chocolate Orange Cake
["4 oz. semi-sweet chocolate", "1 Tbsp. cocoa powder", "2 Tbsp. baking powder", "2 c. sifted pastry flour", "1/2 c. butter", "1 c. sugar", "2/3 c. orange juice", "3 egg whites, whipped stiff"]
["Preheat oven to 350\u00b0.", "In a double boiler, melt the chocolate. In a bowl, sift together the cocoa powder, baking powder and flour.", "In another bowl, cream the butter with the sugar until very light.", "Add dry ingredients and the orange juice, alternating 1/3 of each at a time.", "Blend in the melted chocolate.", "Fold in the egg whites."]
["semi-sweet chocolate", "cocoa powder", "baking powder", "pastry flour", "butter", "sugar", "orange juice", "egg whites"]