M&S Plant Kitchen Vegan Turkey Roast Juicy and succulent pea based joint with a mushroom, cranberry and sage stuffing to create the perfect roast joint. Oven cooks in 55 minutes. Suitable for vegans. Serves 4. M&S Plant Kitchen offers a wide selection of flavour-packed, plant-based products that are totally delicious. Each product is made of 100% plant-based, vegan-friendly ingredients.