Last night I thawed out a nice lump of pork to roast and found an extra unidentified piece in the bag. My husband and a work colleague went halves in a free range pig and the butcher just packaged it all up with no labels, so it's always quite an adventure opening each bag!

So this is the piece I can't identify:

I'm thinking its a hock or something? Oh and it has bones through the middle. My pork anatomy knowledge is quite poor as we never ate pork growing up. What do I do with this piece?