Preheat the oven to 150 degrees. Chop the onion, carrot and celery and fry off in oil over a medium to low heat until soft in a large cast iron pot.
Turn up the heat and add the beef to the pot. Sear until brown all over.
Add the tomato purée, bay leaves, Guinness, beef stock, Worcestershire sauce, sugar and seasoning and cook for 3 minutes, before putting a lid on the pot and cooking in the oven for approx 4 hrs. Check half way through and add more liquid (water or Guinness if getting too dry)
Minutes before the end, heat 1 tbsp olive oil in a pan. Crush the garlic and add to the pan. Fry over a medium to low heat until the oil is infused. Then add the sliced mushrooms and cook until soft
Remove from the oven and shred the beef with two forks. There won’t be much liquid but there should be enough for loosen. If not, add a splash of water. Then add the siracha, cider vinegar and cooked mushrooms. Taste / season and enjoy with baby potatoes or mash.
