Season the lamb shanks with salt and pepper. In the stovetop-safe insert of a slow cooker over medium-high heat, warm 2 Tbs. of the oil. Working in 2 batches, brown the lamb on all sides, 7 to 8 minutes per batch. Transfer to a platter. Warm 1 Tbs. oil in the insert. Add the onion and cook, stirring occasionally, until tender, 7 to 8 minutes. Add the garlic, tomato paste, thyme, cinnamon, cumin, allspice and bay leaf and cook, stirring constantly, for 1 minute. Add the wine and pomegranate juice and simmer for 5 minutes. Add the honey, broth, salt, pepper and lamb. Transfer the insert to the slow-cooker base. Cover and cook on high 3 hours. Add the carrots and cook until the lamb is tender, about 1 hour more. Transfer the lamb and carrots to a large platter. Skim the excess fat off the sauce. Set the insert over high heat and boil until the sauce is thickened, about 10 minutes. Stir in the vinegar. Pour the sauce over the lamb and sprinkle with the parsley and pomegranate seeds. Serve immediately with couscous. Recipe from Williams-Sonoma.