1.Heat half the oil in a large saucepan over high heat. Add pork in 2 batches; cook and stir for 5 minutes or until pork is browned. Transfer pork to a heatproof plate.
2.Reduce heat. Add remaining oil, onion, garlic, celery and carrot to pan; cook and stir tor 5 minutes or until vegetables soften.
3.Return pork to pan with soup mix, tomato and stock. Bring to the boil. Reduce heat; simmer, covered, for 1 hour.
4.Uncover; simmer, stirring casserole occasionally, for 20 minutes more or until pork is tender and sauce thickens. Sprinkle casserole with parsley. Serve with mashed potato.