Makes 5 dozen
1 cup unsalted butter, softened
1 cup sifted powdered sugar
1/4 cup minced candied ginger
2 teaspoons grated lemon peel
2 teaspoons grated fresh ginger
2 1/2 cups all-purpose flour
3/4 teaspoon ground ginger
1/4 teaspoon salt
1/3 cup finely chopped walnuts
60 walnut halves