The butcher counter gets whole steer in every week and we try to use every last bit.  To make our marrow butter, bones are roasted, the marrow is harvested and then whipped with parmesan, green peppercorns, parsley, lemon and salt and pepper which is then blended into a butter base.  Marrow butter can be spread on toast to accompany dinner or used to finish a steak.  A great, unique gift for dad.