Beef Leg is a cheaper cut of beef used for braising and in stews.
It has a good deal of connective tissue in it that breaks down into a superbly flavour gelatin when cooked.
It is usually sold sliced, with the bone in the centre, and with marrow in the centre of the bone.
Chop the meat up to use, but add the bone to the dish for the added flavour and then remove before serving.
The marrow can be just cooked in the stew, or if you have enough slices giving you enough marrow to bother with, you can cook it separately.
Sometimes Beef Leg is sold with the bone removed.
A whole shin can also be roasted very slowly in the oven.