Preheat your oven to 160c (320f)
Pat the beef cheeks dry with paper hand towels and season well with salt and pepper all over.
Heat 1 tbsp of olive oil in a pan over medium - high heat and sear the cheeks all over until well browned. You might have to do it in a couple of batches or get two pans going to save time. Set aside.
Heat 1 tbsp oil in a heavy bottomed oven proof saucepan and fry the pancetta over medium - high heat for 10 mins until browned, lift out onto a plate with a slotted spoon, leaving the fat behind.
Add the onion, carrot, celery and a good pinch of salt and pepper and cook over medium heat until very soft, around 15 minutes. Lower heat if it starts to brown and add more oil if it dries out. Add the garlic and herbs in the last five minutes.
Mix in the tomato paste and let that cook for 2 minutes.
Add the wine, scraping up any browned bits from the bottom of the pot. Simmer for 2-3 minutes to reduce slightly.
Add the tomatoes and stock and bring to a simmer.
Add the beef cheeks and pancetta in. The beef should be mostly covered by liquid and just bobbing at the surface. Add more stock if you need, it's OK if they are poking out slightly.
Cover and cook in the oven for three hours, turning the beef cheeks over in the liquid half way through. At three hours pull one of them out, it should easily fall apart with two forks. If not then cook for a further 30 mins.
Remove the beef cheeks and shred with two forks.
Blend the sauce with a stick blender until smooth (totally optional if you prefer a chunkier sauce).
Return the beef to the sauce. Season to taste and add a generous squeeze of lemon juice to brighten the flavors.
The ragu is even better the next day. If making ahead, cool completely before refrigerating for up to 3 days or freezing.