Marsala sauce is a rich and flavorful sauce that is often served with chicken, steak, pork chops, baked potatoes, or pasta. It is made with Marsala wine, which is a fortified wine from Sicily, and typically includes onions, garlic, mushrooms, and sometimes heavy cream or butter. The sauce is usually prepared by sautéing onions, garlic, and mushrooms in olive oil until tender, then adding flour to thicken the sauce. Marsala wine is then added to deglaze the pan, and the sauce is simmered until it reduces by about two-thirds. The sauce is seasoned with salt and pepper to taste and can be served over the desired dish. Some recipes also include additional ingredients such as rosemary, parsley, or beef or chicken stock.