Heat some olive oil over medium-high heat in a large skillet. Sear the lamb shanks until golden brown on each side, 2 to 3 minutes per side. Remove from the skillet and set aside. Stir together the beans, stock, tea, salt, pepper, garlic and tomatoes in a casserole dish. Lay the lamb shanks on top and sink them down into the beans until two-thirds submerged.
Braise, uncovered, until the lamb is falling off the bone, 4 hours. Serve family-style with some corn pone or crusty bread!