Lightly grease the inside of your slow cooker with oil or cooking spray and turn your slow cooker on high.
Add salt and pepper to your flour and coat the beef chunks before setting to one side.
Heat the oil in a large frying pan on a medium heat. Add the paprika floured beef chunks to your frying pan and brown well before transferring them to the slow cooker.
Add a little more oil to your frying pan and soften the onion before adding the tomato puree, crushed garlic and paprika.
Pour the passata and stock to onion mix and warm through before transferring to the slow cooker.
Stir well and add the bay leaves and leave to cook with the lid on for 6 to 8 hours on low or 4 to 6 hours on high.
Add the sliced red peppers and cider vinegar and stir and cook on high for 1 to 1½ hours with the lid on.
Serve with soured cream and chopped fresh parsley with buttered noodles or a big bowl of creamy mashed potato.