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This slow-simmered recipe for African-style oxtail stew is rich in flavor with celery, onion, garlic, kidney beans, beef bouillon, and beef oxtail.
Place 10 cups water, celery, tomato paste, bouillon cubes, and garlic in a large Dutch oven; stir until tomato paste dissolves. Add peppercorns and bay leaves; bring to a simmer over medium heat.
Meanwhile, heat oil in a large skillet over medium-high heat. Add oxtail; cook until browned on all sides, about 10 minutes. Transfer oxtail to the Dutch oven. Discard all but 1 tablespoon oil from the skillet. Reduce heat to medium; add onion to the skillet. Cook until softened and translucent, about 5 minutes; transfer to the Dutch oven.
Cover the Dutch oven. Reduce heat to medium-low; simmer 2 ½ hours. Season stew with salt and black pepper. Continue cooking, covered, until oxtail is tender, but not falling off of the bone, about 30 minutes more.
Transfer oxtail to a serving dish. Add kidney beans to the Dutch oven; return to a simmer. Dissolve cornstarch in ½ cup water. Stir into the Dutch oven; simmer until thickened and clear, about 1 minute. Pour sauce over oxtail.