In a medium bowl, combine the dark chocolate, milk chocolate, heavy cream, butter, and sugar. Heat in the microwave for 1 minute, stirring every 30 seconds until the chocolate is melted and the mixture is smooth.
Add the water to the melted chocolate mixture and stir until combined.
Pour the mixture into 4 individual serving dishes and refrigerate for at least 1 hour.
Serve chilled with fresh fruit or whipped cream.
Interesting Facts
Chocolate mousse has been around since the 19th century.
Mousse can be made with a variety of different kinds of chocolate, including white, dark, or milk.