Chill this soft dough very well so it holds its shape when rolled in the ginger.
SourceMartha Stewart Living, December 2006
6 ounces crystallized ginger, finely chopped (about 1 cup)
Place two 12-by-16-inch pieces of parchment on a work surface. Divide dough in half; form each half into a rough log on parchment. Fold parchment over dough; using a ruler, roll and press dough into a 1 1/2-inch cylinder. Wrap. Chill at least 3 hours.
Heat oven to 350 degrees. Line two baking sheets with parchment. Spread crystallized ginger on a work surface. Unwrap logs; roll in ginger to coat. Cut logs into 1/4-inch-thick rounds; place on sheets, spaced 2 inches apart. Bake until edges turn slightly golden, about 15 minutes. Transfer cookies to a wire rack to cool. Bake or freeze remaining dough. Store in an airtight container up to 2 weeks.