Pair the broth with the main course. If serving chicken, use chicken broth, if serving beef, use beef broth. You can even use ham or turkey drippings too! Using vegetable broth will make this recipe ...
I create a cornstarch or flour slurry with a little water or broth and then add it in. Ham gravy can be frozen in a freezer-safe container for up to 2 months. I like to freeze mine in small portions ...
But even without them (or not quite enough to match the recipe), this gravy can be made with good-quality chicken stock alone ... add some stock or broth to make up the difference.