Bought some beef bones from my local supermarket. They have a fair amount of meat on them. Not really sure what to use them for. Couldnt decide between a cottage pie or lasagne for dinner. Already have beef mince and saw the bones and they were cheap so just bought them. If I do a cottage pie should I roast the bones first then add them to the sauce? Or if I do a lasagne I could just add the bones to the ragu and cook for longer?