In a large saucepan, combine orange juice, cinnamon and vanilla over
medium-high heat. Bring mixture to a boil, and reduce to low heat.
Simmer 10 minutes. Remove cinnamon sticks. Stir in ice cream. Cook over
low heat, stirring constantly, until heated through. Do not allow
mixture to boil. Serve with mini marshmallows if desired. Makes 4-6
servings.