Lamb with Pumpkin and Mint

This is an Armenian dish and can be served either with steamed bulgur wheat or with couscous which takes virtually no cooking. The dish is traditionally made with lamb shanks. I’m slightly off lamb shanks, which I never really thought were a particularly good cut of the meat; and then they’ve become fashionable and I do hate things that are fashionable. But use lamb shanks if you have them, otherwise use shoulder of lamb, cut through the bone into pieces.