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: 30 minutes
Cook: 20 minutes
Prep: 20 minutes
Cook: 15 - 20 minutes
Prep: 20 minutes plus 3 hours refrigeration
Cook: 30 minutes