Recipe Source: Dave Lieberman, from the June 2007 issue of Bon Appetit
8 ounces fresh Bing cherries, pitted
1/3 cup black cherry preserves or other cherry preserves
1/3 cup ruby Port or cherry juice
1 1/4 cups chilled heavy whipping cream, divided
1/8 teaspoon (generous) ground cinnamon
4 ounces bittersweet or semisweet chocolate, chopped
Combine cherries, cherry preserves, and Port in heavy small saucepan. Bring to boil over high heat. Reduce heat to medium and boil until juices thicken to syrup consistency, stirring frequently, about 10 minutes. Remove from heat. Transfer to small bowl and chill until cold, about 3 hours. DO AHEAD Can be made 1 day ahead. Cover and keep chilled.
Combine 1/4 cup cream and cinnamon in small saucepan; bring to boil. Remove from heat. Add chocolate and whisk until melted and smooth. Transfer chocolate mixture to large bowl. Using electric mixer, beat remaining 1 cup cream in medium bowl until soft peaks form. Fold 1/4 of whipped cream into lukewarm chocolate mixture. Fold remaining whipped cream into chocolate mixture in 3 additions just until incorporated. Divide mousse among 4 glasses or bowls. Chill until set, about 4 hours. DO AHEAD. Can be made 1 day ahead. Cover; keep chilled.
Spoon cherries with syrup atop mousse and serve.