To make the dark chocolate ganache, in a medium, heat-safe bowl add the dark chocolate, cream and peppermint extract and set over a medium saucepan of simmering water. Do not let the bowl touch the water or let the water boil. Stir frequently until almost melted. Stir frequently until melted and smooth. Take off of the heat and stir every couple of minutes to help it cool, stay fluid and thicken.