Broth is traditionally used for braising because it adds depth of flavor to the dish and the collagen/gelatin present in broth enriches the braising liquid, creating a more luxurious texture.
Braising is a cooking method that involves searing food at high heat and then slowly simmering it in liquid. While water can be used, broth is preferred for several key reasons. First and foremost, broth is packed with flavor derived from bones, vegetables, and aromatics. This flavor infuses the food being braised, resulting in a more complex and satisfying final product. Water, on the other hand, is neutral and doesn't contribute any inherent flavor.
Secondly, broth often contains collagen, a protein found in animal bones and connective tissues. During the long, slow braising process, collagen breaks down into gelatin. Gelatin adds a rich, silky texture to the braising liquid, transforming it into a luscious sauce that coats the food beautifully. This textural enhancement is difficult to achieve with water alone. The gelatin also contributes to a fuller mouthfeel and a more satisfying overall eating experience.
Finally, the minerals and other compounds present in broth can also contribute to the overall flavor profile of the braised dish, adding subtle nuances that water simply cannot provide.
If you don't have homemade broth, opt for a low-sodium store-bought variety. This allows you to control the salt level in your braise and prevents the dish from becoming overly salty as the liquid reduces.