Recently, the pork I've cooked in casseroles always seems to be too chewy - even though I've cooked it on a slow setting for many hours in the slow cooker and it falls apart when tested with a knife. I'm sure the answer is to go to a real butcher to ask for advice, but, if I'm limited to supermarket options, what should I go for? Last time it was 'lean pork tenderloin' which I diced myself (no ready diced available of any sort) - cooked in slow cooker for ages with the usual ingredients (tin tomatoes, red pepper, onion, garlic, mixed beans etc). Delicious flavour, but really chewy pork! Maybe it's just me? Advice, please.