Clay Pot Tianu with Lamb, Potatoes, and Onions

Like every other culinary writer who’s been to Puglia in southern Italy, I’ve fallen in love with its cuisine. On a recent visit to the town of Salento, I purchased a massive, heavily illustrated volume filled with stories and tempting regional recipes. My favorite, presented here, marinates lamb shoulder chops with rosemary, garlic, and capers and then has you cook the meat with potato slices, onions, and pecorino Sardo cheese in a shallow clay rectangular baker called a tianu or