1. Preheat oven to 150°c.
2. In a large, pot, combine olive oil, leek & onion. Cook on the stovetop on a low heat till softened. Add garlic. Cook for 1 minute and stir through. In a hot frypan, seal the lamb chunks. Turn once and seal the other side.
3. Pop lamb into the onion/leek pot. Add the beef stock, large carrot, and herbs. Bring to simmer point on top of stove, then pop in the oven (lid on) for 2.5 hours.