chocolate semifreddo Ingredients For crust: 30 chocolate wafer cookies ¾ cup sugar ¼ teaspoon salt 6 tablespoons melted butter For filling: 2 tablespoons plus ¼ cup sugar 4 ounces dark or bittersweet chocolate, chopped 1 tablespoon cocoa powder 4 egg yolks * 1 cup heavy whipping cream ¾ cup mascarpone cheese Chocolate shavings and