Roast chicken, carrots and steamed broccoli. My gravy skills are improving
It's not precisely carb free but pretty good.
What I do for roast chicken gravy, is to turn 2 x carrots, 2 x celery sticks and 1 x large onion (without skin, it darkens the gravy) into batons/slices to act as a trivet for the bird. I'll generally add a couple of bay leaves, some fresh thyme twigs, and a couple of bashed garlic cloves, then top up to the level of the veg with boiling water before banging it in the oven. I'll loosely cover the breast with some foil until the last 20 mins of so, but won't seal the bird into the roasting tin.
Then, when done, I tip any juices from the cavity of the bird into the tin, and remove it to rest. Take a potato masher and squish all the veggie bits to squash out the flavour, and sieve (in my case into a gravy separator to remove the fat) the liquid. Season/thicken as required.