I bought several one-inch beef shank cross-sections from the local supermarket. It looks like concentric circles, with a inner circle of bone and an innermost circle of marrow. I put the shanks in a pot, covered it with water, and braised it for 12 hours at 200 F in the oven. At the end, the collagen had converted into gelatin, but the meat seemed quite tough and chewy.
Is it possible for beef shanks to be super tender? If so, how do you cook them that way?