Serve with fresh fruit, gourmet marshmallows, shortbread, or cubed pound cake. Fondue may begin to harden at the table after about 20 minutes. If that happens, return saucepan to the stove and gently reheat.
In a fondue pot or medium-heavy saucepan, bring crème fraîche, rum, and salt to a simmer over medium heat. Remove saucepan from heat, and add chocolate. Let stand 3 minutes. Stir fondue until smooth. Serve immediately with desired accompaniments.