As you probably know, brining is the act of soaking meat, in this case turkey breast, in a saltwater solution for a period of time, typically overnight, though as little four hours works wonders. The salt in the brine breaks down proteins in the meat known as myosin, offering more space to absorb water and reducing the amount of shrinkage during the cooking process. The result is a tender, moister end product. Typically, I make my brine with a cup each of kosher salt and sugar dissolved in a gallon of water. Sometimes I add peppercorns, garlic cloves or other flavorings.