Mix the chocolate and cream into the top of a double boiler set over simmering water. Heat until the chocolate is melted, stirring constantly; or mix the chocolate and cream in a microwave safe bowl and microwave until melted, stirring every 30 to 45 seconds. Be careful not to let the chocolate burn
Pour into a warm fondue pot. Pour caramel into the center of the chocolate mixture. Do not stir. Add rum to the pot and ignite carefully, using a long wooden match or lighter. Allow flame to burn out and stir gently to mix. Sprinkle with the pecans. Keep fondue warm over low heat.
Serve with cubes of bread, fruit, marshmallows, and cookies.
Source: The Melting Pot