Rioja-braised lamb shanks with chorizo & garlic

This is a terrific main dish to make for a dinner party. After some initial, easy prep, the lamb shanks and some other bits are left to stew in the oven in a wine and balsamic vinegar-flavoured sauce for three hours (with the chorizo and veg added after two hours). This was flavourful and went well with mashed potatoes. Lorraine gives instructions on how to reduce down the sauce for a thicker gravy but I didn't find that necessary.