A rump roast is a boneless cut of beef from the bottom round, the rear leg of the cow. It's a tougher cut of meat than steak, and it usually tastes best when roasted slowly until tender. Rump roast makes a wonderful Sunday dinner meal, especially paired with comfort foods like mashed potatoes or rice. It's also the perfect type of meat to cook in a crock pot or slow cooker. The most popular methods of cooking rump roast is braised in the oven, cooked in a slow cooker, and marinated.