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Preheat oven to 160C (325F).
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In a shallow dish mix together flour, mustard, salt and pepper. Toss beef in flour to coat. Shake off excess flour. Heat oil over a medium to high heat in a large dutch oven (see note 1). Add the beef and cook in batches for 3-4 min until browned on all sides (it doesn’t need to be cooked through just browned on the outside). Be sure not to overcrowd the pan or the beef will stew and not brown. Remove the beef from the pan and set aside.
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Reduce the heat to medium and add the onions with a pinch of salt. Cook for 3-4 minutes until the onions begin to soften. Add garlic and cook for another 2 minutes. Add stout, beef stock, worcestershire sauce, bay leaves, thyme and sugar. Bring the boil then turn off the heat. Add the beef back to the pan, cover with the lid slightly ajar and place in the oven to bake for 2 hours. If the sauce is still too runny and hasn’t quite made a thick rich gravy, then remove the lid completely and place back into the oven for 30 mins. Ensure you check every 10 min and stir to ensure the top doesn’t dry out.
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While the beef is cooking, make your puff pastry and prepare the mushrooms. See below for Gordon Ramsay’s Rough Puff Pastry (alternatively you can always use store bought puff pastry).
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For the mushroom, heat 1 Tbsp oil in a fry pan (skillet) over high heat. Add the mushrooms and cook for 3-5 min. Add the mushrooms to the beef mixture and, if possible, allow to cool (see note 2).
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Increase oven temperature to 190C (375F).
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Place the beef filling in one large pie dish (round or rectangular is fine) or four smaller pie dishes. On a lightly floured surface, roll out the rough puff pastry to just less than 0.5cm (1/4 in) thickness. Cut the pastry to the size of your pie pan(s) and place on top of the beef mixture. Trim the edges and crimp with a fork. Make an egg wash by mixing together the lightly beaten egg and water in a small bowl. Bush over the pie with a pastry brush. Using a knife make two small slits in the centre of the pie to allow the steam to escape.
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Place in the oven for approximately 30 minutes for one large pie, 25-20 minutes for smaller pies or until the pastry is golden and crisp.