Chocolate Truffle Cups

Makes 6 servings.

Source: Tupperware

5 ounces white chocolate baking bar
3 tablespoons ground toasted almonds
6 ounces semisweet chocolate, broken up
1/2 cup plus 3 tablespoons heavy cream, divided
1/4 cup (1/2 stick) butter or margarine
1 egg yolk, slightly beaten
6 pieces chocolate or white-chocolate lace-d