Dissolve coffee in hot water in a saucepan and add the milk, cocoa and butter.
Cook and stir over medium-low heat 'til blended.
Remove from heat, transfer to a large bowl and cool completely.
In a small mixing bowl beat whipping cream and cinnamon 'til stiff peaks form. Fold 1/4 of the whipped cream mixture into the cocoa mixture, then fold in the rest of the whipped cream mixture.
Spoon into dessert dishes and top with additional whipped cream if desired.