Cook With M&S Goose Fat This goose fat is perfect for roasting. Simply add a dollop onto seasoned potatoes, carrots, parsnips or butternut squash and roast in the oven. Best served alongside a Sunday roast. "I’m not saying that the roast potatoes are the most important part of Christmas dinner, necessarily, but I take them very seriously indeed. And for properly rhapsodic roasties, I reach for the goose fat (though I will also countenance duck fat) which can get blisteringly hot without burning, and so help you achieve the roast potatoes of your dreams. A seasonal splurge I never regret!" Nigella Lawson