This wonderful holiday recipe for candied ginger shortbread wedges can be found in Season's Eatings.
Prepare basic shortbread, sifting ground ginger and white pepper with the flour and salt. Add 1/2 cup crystallized ginger to creamed butter mixture before adding flour mixture. At the end of step 2, sprinkle with 1/4 cup chopped crystallized ginger and sanding sugar. Bake until firm and just starting to color, 30 to 40 minutes. Cool completely before cutting into wedges. Cookies will keep, in an airtight container, at room temperature for 1 week.