The topside roast is a hefty piece of meat that comes from the inside of the hindquarters and top of the leg and is a boneless cut. Even though it has a layer of fat on one of its sides, the topside roast is super lean with minimal marbling (streaks of fat) which gives you the chance to make a fabulous slow-cooked roast. But being so lean means that if its not cooked right you could be left with a chewy roast.