In a small saucepan combine chopped chocolate, egg yolks, sugar, water, and 1/2 cup of the whipping cream. Cook and stir over medium heat until mixture starts to bubble around edges. Remove from heat. Pour into a large bowl set in a bowl of ice water. Cool 15 to 20 minutes, stirring frequently.
In a chilled mixing bowl beat remaining 1 cup whipping cream with chilled beaters just until thickened (do not beat to soft peaks or mousse will be too stiff). Fold into cooled chocolate mixture. Cover and chill in the refrigerator 2 to 24 hours.
Spoon mousse into individual bowls. Serve with Cinnamon Poached Pears. Top mousse with additional whipped cream and chocolate shavings. Makes 8 servings.