There is no one secret to making good gravy, but there are a few things that will help you make the best gravy possible. First, start with a good base. A roux made with equal parts flour and fat is a good place to start, but you can also use a stock or broth as your base. Once you have your base, add in your flavorings. This is where you can get creative and add in whatever seasonings you like. Just be sure to balance the flavors so that none of them are too overwhelming. Finally, let your gravy simmer until it thickens and then serve hot!