Sauté pork in oil in a large skillet until color changes on all sides (do not brown). Add onion and celery; sauté until tender. Add 1 cup water, and bring to a boil. Reduce heat; cover and simmer 5 minutes.
Combine remaining 1/4 cup water, cornstarch, and molasses; stir until smooth. Add cornstarch mixture and soy sauce to pork. Cook, stirring constantly, until thickened and bubbly. Add bean sprouts and water chestnuts; cover and simmer an additional 5 minutes. Serve over rice, and garnish with noodles.