Preheat the oven to 160℃/325F fan, 180℃/350F or Gas Mark 4.
Heat half of the olive oil over a high heat and fry the beef pieces in batches until brown all over. Add the rest of the oil when needed.
Put the beef to one side and add the pancetta chunks to the pan. Fry until golden brown (about 5-10 minutes).
Add the onions, garlic and celery to the pan. Fry for 5 minutes until starting to soften.
Add the carrots and swede and cook for a further 5 minutes.
Add the plain flour and mix to coat all of the vegetables. Cook for 5 minutes, stirring.
Add the Guinness, tomato puree, thyme, beef stock and plenty of salt and pepper. Add the beef back in and give everything a good stir.
Pop a lid on and put it into the oven for 2.5-3 hours or until the meat is meltingly soft.
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