Brown pork in shortening in a heavy skillet over medium heat; drain well.
Place pork in a large Dutch oven; sprinkle with salt and pepper. Add tomato sauce, onion , celery, water, catsup, brown sugar, mustard , and Worcestershire sauce; stir well. Cover and cook over low heat 2 hours and 10 minutes. Uncover and simmer an additional 20 minutes, stirring occasionally. Serve over rice.