or until just firm enough to roll. Sift a light dusting of confectioners' sugar over the truffles. Lightly coat your palms and fingertips with confectioners' sugar. With your fingertips, pinch a truffle into a round, then roll it gently between your palms into a round ball. Place the truffle on the baking sheet, and form the remaining truffles into rounds. Refrigerate or freeze for about 10 minutes, just until firm. Roll the truffles in sifted cocoa powder to coat. Refrigerate. Decorate the cheesecake: Run a thin-bladed knife around the edge of the cheesecake to loosen it from the side of the springform pan. Remove the side of the pan. Slide two metal cake spatulas under the cheesecake and transfer it to a serving platter. Using a metal cake spatula, spread the reserved room-temperature chocolate ganache evenly over the top and sides of the cheesecake. Place the chocolate truffles around the outside edge of the top of the cheesecake, spacing them evenly. Melt the white chocolate according to the instructions in the Chocolate Key. Using a fork, drizzle/shake the warm white chocolate in a decorative zigzag pattern over the top of the cheesecake. Refrigerate the cheesecake for at least 6 hours, or overnight, before serving. (The cheesecake can be prepared ahead and refrigerated for up to 5 days.) Remove the cheesecake from the refrigerator 30 minutes before serving. With a sharp, thin-bladed knife, cut the cheesecake into dozen truffle-topped slices, dipping the blade in hot water and wiping it dry after each slice. Recipe By :