Chocolate-Dipped Strawberries

In a medium-sized bowl, whisk the heavy cream and sour cream until the mixture is smooth. Refrigerate covered for at least two hours. Working over a piece of waxed paper, use a potato peeler to shave the chocolate bar. Put the chocolate shavings into a small bowl and set aside. Sift the confectioners' sugar over the waxed paper, then transfer the powdery sugar into a separate small bowl. Just before serving, pour the cream mixture into a small bowl, too. Arrange the strawberries around the three bowls on a platter and serve. Guests should first dip the strawberries into the cream, then into the sugar, and finally into the chocolate. Makes 6 servings.