I found a Delia recipe called rissoles. You take the left over roast, an onion, parsley, pinch of cinnamon, breadcrumbs and an egg, mince it together in a food processor (or else do it all by hand which would take ages), form them into patties, coat with seasoned flour and fry them in a pan with just a touch of oil. I found them to be better than they sounded, and a good way to make leftovers stretch.