You can! Try using 3 to 4 lamb shanks depending on how many people you want to serve and how many shanks fit into your pot. I find 1 shank serves 1 to 2 people depending on how big it is. You can reduce the oven time to 3 hours for shanks. For big lamb chunks, try cooking the dish for around 2.5 hours. Keep the chunks on the larger side - 2 inches/5cm square or even larger.