Herb & pepper crusted rib of beef
Planning a dinner party? James Martin's crusted roast beef will wow your guests
Boil the potatoes in salted water until tender, about 15 mins. Drain, replace the lid on the pan, then shake to break the potatoes up a bit. Add the beans, cream, butter and 2 tbsp truffle oil, then mash together well. Season liberally with salt, pepper and a good pinch of grated nutmeg, and drizzle with the remaining truffle oil.