Chef John's Irish Stew
Pay attention to the cut of lamb used in this recipe. I used lamb shoulder chops, which are a fantastic value, when you consider flavor, useable meat, and price. They will probably be the cheapest lamb at the store, have more flavor and richness than leg meat, and are cheaper than shanks and loins. It takes a while for the meat to braise and fall off the bone, but it's a wait rewarded with tender, succulent chucks of lamb.
I merged the best of two family recipes, then fiddled a bit. Pretty easy. Very Spicy if you use hot Portuguese sausage. Both the sausage(chourico or linguica) and jarred peppers (Pimenta Moida) are available online if you don't have a Portuguese market in your town. I prefer linguica for flavoring soups because is has just a little more fat. If you are trying to limit the fat, stick with chourico.