PreparationRoast sweet-potato cubes: Put oven rack in middle position and preheat oven to 450°F. Toss sweet potatoes with oil and salt, then spread in 1 layer in a large shallow baking pan. Roast, stirring and turning over once or twice, until tender and browned, 35 to 40 minutes. Cook rice while sweet potatoes roast: Bring water, rice, and salt to a boil in a 2- to 3-quart heavy saucepan, then reduce heat and cook, tightly covered, until rice is tender and water is absorbed, about 15 minutes. Let stand, covered, off heat 5 minutes, then fluff with a fork. Toast pumpkin seeds while rice is cooking: Toast pumpkin seeds in a dry 10- to 12-inch heavy skillet (not nonstick; preferably cast-iron) over moderate heat, stirring, until seeds are puffed and pale golden, 3 to 4 minutes. Transfer to a bowl and stir in oil and salt to taste. To serve: Reheat black beans, thinning with water if necessary, then serve along with rice, sweet potatoes, pumpkin seeds, and accompaniments, each in a separate bowl.
PreparationRoast sweet-potato cubes: Put oven rack in middle position and preheat oven to 450°F. Toss sweet potatoes with oil and salt, then spread in 1 layer in a large shallow baking pan. Roast, stirring and turning over once or twice, until tender and browned, 35 to 40 minutes. Cook rice while sweet potatoes roast: Bring water, rice, and salt to a boil in a 2- to 3-quart heavy saucepan, then reduce heat and cook, tightly covered, until rice is tender and water is absorbed, about 15 minutes. Let stand, covered, off heat 5 minutes, then fluff with a fork. Toast pumpkin seeds while rice is cooking: Toast pumpkin seeds in a dry 10- to 12-inch heavy skillet (not nonstick; preferably cast-iron) over moderate heat, stirring, until seeds are puffed and pale golden, 3 to 4 minutes. Transfer to a bowl and stir in oil and salt to taste. To serve: Reheat black beans, thinning with water if necessary, then serve along with rice, sweet potatoes, pumpkin seeds, and accompaniments, each in a separate bowl.