Break the chocolate into small pieces. Warm the cream and add the chocolate. Stir constantly over low heat until melted. Dissolve the espresso powder in the whiskey and stir into the chocolate. Place over a low heat source (do not allow to boil or burn).
Flavor Variations
Nuts - Add nuts to your fondue such as chopped pecans, walnuts, or hazelnuts.
Other liqueurs that pair well with chocolate include;
Chocolate mint liqueur
Frangelico (hazelnut liqueur)
Cognac
Grand Marnier
Rum