Suet dumplings are a traditional british dish made from flour, suet, and water or milk. They are usually boiled in water or broth and served with gravy. While you can cook suet dumplings on their own, they are typically served as part of a dish.yes, you can cook suet dumplings on their own. However, they will not be as moist or flavorful as if you cook them in a stew or gravy. If you are looking for a quick and easy way to cook suet dumplings, simply boil them in water for 10 minutes.