Get full access to Outside Learn, our online education hub featuring in-depth fitness, nutrition, and adventure courses and more than 2,000 instructional videos when you sign up for Outside+. If all you know is store-bought stock, wait until you discover how versatile and delicious the homemade variety can be. It’s also a smart way to reduce food waste: chicken carcasses, beef bones, carrot tops, potato skins, and herb stems are fair game.