M&S Deep Filled Steak Puff Pastry Pie Butter enriched puff pastry pie deep filled with tender cuts of British beef in a rich roast beef gravy. Serve with buttery mashed potato and garden peas. Oven cooks in 30 minutes. Serves 3. 100% of M&S Select Farms products meet our high quality and environmental protection standards. We know and trust all our Select Farmers, so you can trust M&S for your fresh food.