A family favorite from the Ropers, fifth-generation citrus farmers in Orange County, Florida.
Boil gently 6-8 yams until tender. Cool in the water until easy to handle. Remove skin and cut into 1" pieces. Place in a buttered 11x13 casserole dish. Cover with brown sugar, drizzle orange juice over the top, add pecans if desired, cover again with brown sugar and dot with butter. Bake at 350° until juices are absorbed. To "gild the lily" you may add marshmallows toward the end but they are not necessary.