Using stocks in place of water in a recipe gives an added dimension of flavor, so they're well worth making and using if you can. Many of the stocks in this book are described within the recipes, but here is a general method of making a variety of stocks.
The key to making good stock is to simmer it very slowly for a long time, with only a few bubbles breaking on top of the pot. Slow-cooked stocks come out clear and full of flavor. The longer you cook a stock, the more intense it gets and the less of it you need in a recipe.
Stocks hold up for a few days in the refrigerator or for a long time if well sealed in a freezer. Many cooks freeze stock in ice-cube trays, so they can slip out a few cubes and add it to recipes conveniently.
Canned chicken stock can be used if you don't have your own. It's not as good, but it's acceptable. Canned beef stock is not very good, and I wouldn't recommend using it.
