Chocolate Mouse Filling

Dissolve the cocoa powder in the hot water. In a double boiler or in the microwave
melt the chocolate chips just until smooth. Add the cocoa mixture and stir well to
combine. Allow the chocolate to cool completely before adding the whipped cream
in the next step.

In separate bowl, beat the heavy whipping cream and sugar until stiff peaks form.
Add the whipped cream mixture to the melted chocolate and fold in with a spatula
until well combined. Refrigerate until ready to use.