Trim any sinew from the beef cheeks and cut them in half.
Heat the oil in a large sauté pan and sear the beef cheeks for a few minutes, on all sides, in batches.
Transfer to the slow cooker.
Add the pancetta to the pan and cook over a medium high heat for 3-4 minutes.
Reduce the heat and add the onions, celery, garlic, rosemary and oregano.
Cook for 10 minutes until the onion is softened but not coloured.
Add the tomato paste, wine, passata and sugar and stir to combine.
Season to taste with sea salt and freshly ground black pepper and bring to a boil.
Add to the beef in the slow cooker.
Cook on low for 8-10 hours until meltingly tender.
Shred the beef and add back to the sauce.
Serve over the hot pappardelle and top with parmesan and fresh oregano.
