1. Heat oven to 400ºF. Grease and flour round pan, 8x1 1/2 inches.
2. In medium bowl, beat 1/2 cup sugar and the butter with electric mixer on medium speed until smooth. Stir in eggs and melted chocolate until smooth and blended. Stir in flour. Pour into pan.
3. Bake 18 to 20 minutes or until toothpick inserted in center of torte comes out clean. Cool 10 minutes; remove from pan to wire rack. Cool completely, about 1 hour.
4. Meanwhile, add enough water to reserved juice to measure 1 1/4 cups. In 1 1/2-quart saucepan, mix 1/4 cup sugar and the cornstarch. Stir in juice mixture and raspberries. Heat to boiling over medium heat, stirring frequently. Boil and stir 1 minute; cool. Strain sauce through a strainer to remove seeds. Serve torte with sauce.