This started life as a comment in
or_mabinogi's LJ, but I decided to post it here, too.
Gravy, at its most basic, is equal parts of oil and flour with water added until you get the texture you want. That's it. Not rocket science, folks. Gravy is a *great* tool in the cook's toolbox. It can be used to cover potatoes or dressing or some kind of meat. It can be used to add thickening and flavor to soups and stews and makes a great basis for one of those "what's in the fridge" meals we all end up throwing together from time to time (or four nights a week ;-).
You can flavor it with broth or wine or any combination of seasonings available in your kitchen. Pretty much, gravy is a canvas for you to paint on. Nothing more, nothing less. The only limits are your own imagination and the contents of your kitchen.
Making Gravy.
Gravy is actually very easy. It helps if you've got a good heavy skillet and a whisk, but they aren't essential. As I am whiskless at the moment, I tend to use a wooden spoon. I prefer some sort of non-stick skillet, but I've made gravy in sauce pans and, on one unforgettable occasion, in a cake pan sitting in a larger cake pan with a piece of a brick in it, sitting on a burner. It worked, but I wouldn't advise it. :-)
You start with equal amounts of oil and flour. I find olive oil makes the best gravy of all time but any oil will do. I suggest not using butter due to its low "smoke point".
Heat the pan (medium heat should work), then put in the oil. Get the oil nice and hot. Then sprinkle in the flour (and don't stress over "sprinkle" :-). Whisk, if you've got it, or just get in there and stir with a wooden spoon. It's going to be a clumpy mess, but that's okay. That's what it's supposed to look like. Let it cook for a little bit, stirring constantly. A couple of minutes would probably do until you feel more confident that you can keep it from burning.
Then, start adding the water (or wine or broth or whatever - I'd start with the hot water, though). Hot water from the tap is great. You'll want to add it a little at a time, stirring it in (this is where the whisk really comes in handy since it helps reduce the risk of lumps). Just keep adding water and stirring until you've got it well-thinned.
Add any seasonings you might want and if you're using it as a base for a dish, this is when you go ahead and add any meat and or vegetables.
Add liquids as needed. If it clumped, the longer you cook it, the more likely the lumps will cook out.
It's gonna lump at first, until you've got more experience, but it's one of those handy cooking skills that can be *very* useful in so many different settings. And at first, feel free to use cheaper vegetable oil until you feel like you've got the knack. You may end up dumping it a few times and starting over. :-) Or not. More liquid and longer cooking can solve a lot of gravy troubles. :-)