When the parsnips are ready, put olive oil into a solid, shallow baking tray and place it on the hob, over direct heat turned to low.
Put the oil into a heavy based, shallow roasting tray and place it in the oven for a few minutes, until the oil is really hot. Using an oven cloth to protect your hand, place the hot tray over a low direct heat on the hob. When the oil is sizzling, add the parsnips to the oi with a large, spoon. Baste the parsnips with the oil, tilting the tray and turning them over to coat evenly.