M&S Minced Beef & Onion Puff Pastry Slices Minced Beef & Onion Slices made with tender British minced beef and onions in a rich gravy, encased in a flaky puff pastry. - Serves 2 - Ready to eat - Best served hot, bake in the oven for 20 minutes (from chilled) - If serving cold, remove from the fridge 30 minutes before serving - Perfect for a snack or pairing with a salad for a classic lunch - Suitable for home freezing