This more expensive cut benefits from high-heat roasting rather than braising

Slice onions in rings. Heat oil in a large oven-proof pan, like cast iron. Sauté the onions until golden, adding sugar to increase their natural sweetness.
Once the onions are caramelized, remove from the pan and set aside.
Place the pan back on the heat. Rub salt and pepper generously over the roast and sear it, top and bottom until it has a nice crust.
Place the reserved onions on top of the roast and put the pan into a 400 degree oven. Roast, uncovered, for 1 1/2 Hours. Remove from the oven and allow it to rest 15 Minutes. Slice and serve with the caramelized onions.
You can also freeze it sliced. Bring back to room temperature and reheat 20 Minutes in a 350 degree oven.
