Crumb the wafers in the food processor. Set aside. Using food processor’s grater attachment, grind the chocolate.
Boil the water.
Combine cocoa powder, grated chocolate, and hot water, mix well, till everything dissolves. Add confectioner’s sugar and vanilla extract and mix till incorporated. Add orange zest.
Puree tofu in a food processor till smooth. Add the chocolate mixture and blend till everything is well incorporated.
Assemble the mousse by layering wafer crumbs and tofu mixture twice. Decorate top with a few left-over crumbs and orange zest.
Refrigerate for at least 1 hour before serving.