1. Place sweet potatoes in a large saucepan or Dutch oven; cover with water. Bring to a boil. Reduce heat; cover and cook for 25-30 minutes or just until tender. Drain.
2. In a large bowl, beat the sweet potatoes, concentrate, sugar, cream and butter on low speed until smooth. Stir in 3/4 cup marshmallows and pecans; set aside.
3. Remove pulp from oranges, leaving a shell. (Discard pulp or save for another use.) Spoon sweet potato mixture into shells. Place four marshmallows on top of each.
4. Place in a greased 15-in. x 10-in. x 1-in. baking pan. Bake, uncovered, at 350° for 20 minutes or until heated through. Yield: 8 servings.