I have a constant supply of stock in my freezer it makes a base for my soups, stews, pies, sauces and risotto. You can lamb bones easily enough from your butcher or meat supplier at your local farmers market.
Prep: 15 minutes plus 30 minutes for the steak to marinate
Cook: 10 minutes
Prep: 10 minutes
Prep: 20 minutes plus 2-3 days marinating