Preheat oven to 350 degrees. Rub the inside of an ovenproof casserole with a bit of oil or spray it with cooking spray to prevent sticking. Add the calabaza, apricots, and orange juice. Sprinkle with the brown sugar and cinnamon and dot with butter. Cover with aluminum foil and bake for 30 minutes, or until the calabaza is fork tender. Serve hot.