1 4–5 pound bone-in (or 3–4 pound boneless, if that’s all you can find) shoulder or leg of lamb, untied
Kosher salt, freshly ground black pepper
1 750ml bottle dry white wine, such as pinot grigio
2 pounds waxy potatoes, such as yukon gold, large fingerlings, etc. peeled or unpeeled, halved or left whole, depending on size
2 heads garlic, unpeeled, halved crosswise
1 lemon, halved crosswise, plus another for serving
1 bunch oregano, marjoram or thyme; plus more for serving
Olive oil, to drizzle
1-2 cups tender herbs, such as parsley, dill, chives, mint, for serving
Greek yogurt or labne seasoned with salt, pepper and garlic, for serving
*If you don’t have a large dutch oven, you can do this in a large roasting pan or baking dish, as long as you really cover it well with foil to prevent evaporation of liquid.
*If using boneless, it will be closer to 8 hours
DO AHEAD: This lamb can be made 3–4 days ahead, stored in the fridge and covered. To serve, gently reheat in the same pot in a 275° oven until lamb and potatoes are warmed through and scatter with herbs.