1/2 cup egg whites (from about 4 eggs)
2/3 cup sugar
1/2 teaspoon mint extract or mint flavoring (not mint oil)
2 ounces unsweetened chocolate, finely chopped or grated
2 ounces semisweet chocolate
Additional equipment: A pastry bag fitted with a large plain or star tip, 2 cookie sheets, well greased, or lined with parchment paper, or lined with nonstick baking mats, or 2 nonstick cookies sheets.