I hope- pray even- that this Christmas you are going to make some genuine, home-made gravy. I know that some poor souls out there skip this, and make that stuff straight from the packet. And I loathe that. Starchy, synthetic, a nasty brown colour, gloopy- quite horrible. Ruins everything else on the plate.
What is gravy? I had a few protest emails when I had the temerity to suggest that "gravy' in the United States, is what we call a white sauce. Ok, ok, I realise now that this is a term from the Deep South, and that some of you up on the East Coast have a similar thing to us in Britain. Serves me right for hanging out with a bunch of wannabe Confederates.
Proper gravy (or jus, if you live in Hampstead) should be thin (I can't stress that enough), and made from the juices left over from your turkey, beef, or joint.
Once the meat has cooked, lift out your joint, and let it rest. You will have the oven pan left over with the meat juices left behind, and probably some caramelised burnt bits as well. Pour off the surplus fat floating on the top.
Over a moderate heat, stir in a small bit of flour, so that it soaks up the juices, and let it cook for a bit. It's now time to deglaze the pan. This means adding liquid to soak up the burnt bits left on the bottom of the pan. You can use wine, or stock- or a combination of both. For stock, I normally use the water left over from any vegetables that you are cooking at the same time. If you're making a light coloured gravy, say for chicken or turkey, I would use white wine. If you're making a darker gravy for beef, I would use a red, say a Beaujolais.
Let it bubble away, and then finish it off with a tiny splash of soy sauce. This adds a bit of colour, and intensifies the flavours. Strain off the gravy, and serve it in a sauce boat. I prefer my gravy to be very thin, light as well, and it's important when you serve it, not to let it swamp everything else on the plate. Apart from that, it's all pretty straightforward. Good Luck!