This is one of those easy-to-knock-up-at-the-last-minute dishes that nevertheless taste exceedingly good. It’s also delicious cold. Use a free-range bird or at least a corn-fed one. Sweet potatoes from the Pacific and olives from Europe may not seem natural soulmates but, well, eating is believing. It’s that sweet and salty combination again - you’ll find they work marvellously well together.