1Heat oven to 375°F. Line cookie sheet with cooking parchment paper. In large bowl, mix granulated sugar, eggs, almond extract and 3 tablespoons of the rum with whisk until blended. Stir in flour, baking powder, nutmeg, cardamom, cinnamon and salt. Stir in almonds, hazelnuts, raisins, currants, cherries, lemon peel and ginger. Divide dough in half; place on cookie sheet. Using floured hands, shape dough into 2 (8x4-inch) logs about 3 inches apart.
2Bake 35 to 40 minutes or until light golden brown. Cool 15 minutes. Place logs on cutting board; cut into 1/2-inch slices. Place cut sides down on cookie sheet. Bake 10 minutes. Turn slices over; bake 10 minutes longer. Remove from cookie sheet to cooling rack. Cool. In small bowl, mix powdered sugar and remaining 1 tablespoon rum until smooth. Drizzle over tops of biscotti.