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Heat oven to 350°F.
Make the cookie dough: Cream the butter until smooth in a mixer fitted with a paddle attachment. Mix in the sugar. A little at a time, mix in the egg whites, then add the vanilla and lemon extracts. Add the flour and mix just until incorporated. Transfer the dough to the pastry bag.
Pipe 1-inch long sections of dough onto the sheet pans, spacing them 2 inches apart (they will spread sideways). Bake until golden on top and brown around the edges, about 10 minutes. Let the cookies cool on the pan.
Make the mint glaze: Whisk the egg white with 1½ cups of the powdered sugar until smooth. Whisk in more sugar a little at a time, just until you have a thick, smooth glaze. Add mint extract to taste.
Make the chocolate glaze: Melt the chocolate. Spread the flat sides of half of the cookies with chocolate. Spread the flat sides of the remaining cookies with mint glaze. Sandwich together and set on a clean sheet pan. Let the cookies sit at room temperature until firm, at least 1 hour. Makes 80. |