A fabulous alternative to the traditional bird at Christmas, this dish takes deserved billing as the ‘main event’. Serves 6 Prep time: 25 minutes Cooking time: 55 minutes plus one hour, chilling   Ingredients: 800g beef fillet 2 tbsp vegetable oil 500g watercress 12 slices smoked prosciutto 500g ready-made puff pastry 2 egg yolks […]