1 tablespoon gelatin
2 1/2 cups strong black coffee
1 square semisweet chocolate, chopped
1/2 cup granulated sugar
1 cup heavy cream
2 to 3 tablespoons coffee liqueur
Finely-grated chocolate (for garnish)
Dissolve gelatin in a little of the coffee in a bowl. Put chocolate and half the coffee in a saucepan and stir to melt over very low heat. Stir in sugar and gradually stir the mixture into the gelatin. Stir in remaining coffee and chill. Stir in cream and liqueur and pour into a container. Cover and freeze until firm.
About 45 minutes before serving, transfer ice cream to the refrigerator. Serve decorated with grated chocolate.
Serves 6 to 8.