Meanwhile, drain juice from raspberries into 1-cup glass measuring cup; add enough water to measure 3/4 cup. In 1-quart saucepan, stir together juice mixture, cornstarch, 2 tablespoons sugar and 2 tablespoons marmalade. Heat to boiling, stirring occasionally; remove from heat. Cool 15 minutes. Stir in raspberries. Serve sauce with French toast.