When it comes to presentation, nothing can compare to a lamb shank. Add some roast vegetables, such as Brussels sprouts and root vegetables, to complement the lamb, but be sure to leave plenty of space for the main attraction.
Combine the lamb jus with the vegetables and bring to a boil.
When the vegetables are tender, add the tomato, whisk in the butter, and add the rosemary and parsley.
Adjust the seasoning. Reserve for serving.