Makes about 2 dozen cookies.
Note: This dough must be prepared in advance. Candied orange peel can be found in the baking aisle of most supermarkets. Substitute the freshly grated peel of 1 orange for candied orange peel. Espresso powder, such as the Medaglia D'oro brand, can be found in the coffee aisle of most supermarkets. From Elizabeth Davis of Wayzata.
For dough:
• 1/2 c. (1 stick) butter, at room temperature
• 1/4 c. granulated sugar
• 1/4 c. packed light brown sugar
• 1/4 tsp. baking soda
• 1 egg