In a small bowl, combine 2 tablespoon Plain flour, and 1 pinch Sea salt and ground black pepper.
Add the flour to 1.3 kg Welsh lamb shoulder. Mix well so that all the lamb is coated.
Heat 1 tablespoon Olive oil in a pan and add the coated lamb. Heat so that the lamb is browned on all sides, about 5 minutes. Once browned, set aside.
Add 2 Carrots, 1 rib Celery and 1 Onion to the pan. Cook until softened, about 5 minutes.
Add the softened vegetables to the slow cooker and then add the lamb.
Add 3 Garlic clove, 1 teaspoon Dried rosemary, 200 ml Lamb stock, 60 ml Red wine and 1 tablespoon Worcestershire sauce.
Add 1 tablespoon Tomato puree and 400 g Chopped tomatoes. Mix well.
Cook on low for 7 hours or high for 5 hours.
Notes
If you wanted to add some extra flavour to this lamb ragu, then you could deglaze the pan after you have softened the onions, carrot and celery. You can do this with the red wine and lamb stock. This will help to release the browned bits at the bottom of the pan which will add lots of flavour.
Another way to add lots of flavour is to add a Parmesan rind to the slow cooker bowl with the rest of the ingredients.
Traditionally, a little bit of (double) heavy cream and Parmesan would be added to the ragu and pappardelle mix to make it extra indulgent, but we left that out to keep this a little bit lighter.
If the ragu feels a little too thick once mixed with the pasta, then you can loosen it up a little with starchy pasta water.
You can add some chopped bacon or pancetta for extra flavour.