Mascarpone Semifreddo with Raspberry Sauce Recipe

Ingredients

• Two 10-oz. packages frozen raspberries in syrup, thawed
• 1 t cornstarch dissolved in 2 T water
• 1 t fresh lemon juice
• 3 large eggs, separated, at room temperature
• 1/3 cup sugar
• 1/2 pound (1 cup) mascarpone (available at most cheese shops and some specialty foods
• shops)
• 1 1/2 t pure vanilla
• 1/2 t freshly grated lemon zest
• 2 oz finely grated fine-quality semisweet chocolate
• Fresh raspberries for garnish if desired