Place the mince, onion, Rhodes Quality Tomato Paste, Worcestershire sauce, mustard, parsley and salt and pepper into a large bowl and mix well. Divide into 15-20 small, rounded meatballs and set aside.
Heat the oil in a large frying pan and fry the meatballs for 7 – 10 minutes, browning them on all sides during cooking. Remove and set aside to rest in the pan.
Place the potatoes into a large pot and cover with cold water, bring to the boil and boil for 20 – 25 minutes, until soft.
Mix the Bisto Gravy for Roast Beef Powder and boiling water and mix well, set aside.
Remove the potatoes from the stove and drain off the water, mash with a masher and stir in the butter and milk and season with salt and pepper.
Heat the meatballs just before serving and serve on top of the mash and pourover the hot gravy.