Place the grated chocolate, milk powder, and orange zest in a large mixing bowl and combine thoroughly. Spoon the mixture into tin or jar for gift-giving.

Label with instructions: To serve, use 1/2 cup of chocolate mixture to 1 cup of hot milk or water. Pour the milk or water into a saucepan and heat until hot. Stir in the hot chocolate mixture and bring just to a boil. Pour into cup or mug and add marshmallows, if desired.