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: 2 hours & 20 minutes (plus marinating overnight, optional)
Prep: 10-15 minutes
Cook: 20 minutes
Prep: 15 minutes plus 3 hours freezing