A rump roast (called silverside in the UK) is a 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. Most roast are 2-3 lbs.