To make the white chocolate cream: heat the milk over low-medium heat until bubbles form around the edges of the saucepan. Place the white chocolate pieces in a small bowl and pour the hot milk over. Whisk until the chocolate is completely melted.
Meanwhile, in a medium bowl, whisk the sugar into the mascarpone. Set aside. In a small, chilled bowl, whip the cream with the vanilla until soft peaks form (do not overbeat.) Whisk the white chocolate mixture into the mascarpone. Fold in the whipped cream. The texture should be like lightly whipped cream; if it doesn't "flow", thin the mixture slightly by stirring in some milk, 1 tablespoon at a time.
Spoon the liqueur evenly over the cake slices. Place 1 slice of cake in the bottom of each goblet. Spoon half of the cream mixture over the cake slices (about 2 1/2 tablespoons for each slice.) Sprinkle each with 1/2 tablespoon of the grated chocolate. Slice 8 strawberries and place some slices over the chocolate in each goblet. Repeat the cake, cream and chocolate layers. Refrigerate for 4 to 8 hours.
To make the chocolate leaves: line a plate with waxed paper. In a double boiler over low heat, melt the grated semisweet chocolate. Remove the chocolate from the heat. Using a pastry brush, spread the underside of each leaf with a layer of chocolate. Place the painted leaves, chocolate side up, on the prepared plate. Freeze until the chocolate is set. Carefully peel the leaf off the chocolate, handling the chocolate leaf as little as possible. Return the leaves to the freezer if the chocolate is melting.
Just before serving, top each tiramisu with raspberries and garnish each with a strawberry half and chocolate leaves.
Recipe courtesy of B. Smith, Rituals and Celebrations, Random House, 1999