Preheat oven to 160°C.
Finely dice the onion and chop the garlic. Set aside.
Bring a deep casserole type dish to high heat, drizzle olive oil and sear the lamb shanks for 2-3 minutes on each side until golden brown. Remove from casserole and set aside.
Using the same casserole, sauté the onion and garlic for 3 minutes until softened and golden. Add the bay leaves and passata. Season with sugar, salt, pepper and a sprinkle of the Italian spice mix. Stir through and bring to the boil.
Add the chicken stock and ½ of the basil to the casserole. Bring to the boil again. Place the shanks into casserole, cover with a lid, place in the oven and cook for 3 hours.
CHEF'S TIPS FOR COOKING AND LEFTOVER...