Heat a double boiler over medium-low heat. Add the chocolate and cream, and stir until melted. Stir in the whiskey.
Pour the chocolate sauce into a bowl. Place the graham cracker crumbs in a small bowl. Place the cooking gel container into a cast-iron mini cocotte, light it and toast the marshmallows on sticks.
Dip the marshmallows into the chocolate sauce, and then into the graham cracker crumbs.