Prepare the Lamb Shanks: 1.1. Pat the lamb shanks dry with paper towels and season them with sea salt, black pepper, and dried thyme.
Sear the Lamb Shanks: 2.1. Heat the ghee or clarified butter in a large skillet over medium-high heat. 2.2. Add the lamb shanks and sear them on all sides until they are browned. This should take about 4-5 minutes per side. Transfer the lamb shanks to a slow cooker.
Prepare the Aromatics: 3.1. In the same skillet, add the minced garlic and chopped onion. Sauté until the onion is translucent and the garlic is fragrant, about 5 minutes.
Deglaze and Combine: 4.1. Pour the red wine into the skillet (if using) and deglaze the pan, scraping up any browned bits from the bottom. 4.2. Add the bone broth to the skillet and bring the mixture to a simmer. 4.3. Pour the broth mixture over the lamb shanks in the slow cooker.
Add Herbs and Cook: 5.1. Add the fresh rosemary sprigs to the slow cooker. 5.2. Cover and cook on low for 6-8 hours, or until the lamb shanks are tender and the meat is falling off the bone.
Finish and Serve: 6.1. Carefully remove the lamb shanks from the slow cooker and place them on a serving platter. 6.2. Strain the cooking liquid into a saucepan and simmer over medium heat to reduce it slightly and concentrate the flavors. 6.3. Serve the lamb shanks with the reduced sauce spooned over the top.
Enjoy your slow-cooked lamb shanks with rosemary and garlic, a hearty and delicious meal perfect for a carnivore diet!