After roasting your meat, scrape up any browned brits from the sides and bottom of the pan, then strain the drippings from the pan through a mesh sieve into a fat separator or into a measuring cup. Let sit for a few minutes so the fat rises to the top. Skim off about ¼ cup of the fat for your roux and reserve the rest of the drippings. If you don't have enough, sub the rest of the amount with some melted butter.
¼ cup pan drippings
Place your heat safe roasting pan (or a saucepan) on the stove over medium heat. Add the reserved drippings fat to the pan, then whisk in the flour, stirring constantly, until the roux smells nutty and has the consistency of a thick paste, about 3 minutes.
3 tablespoon all purpose flour
Slowly whisk in the rest of the pan drippings and your broth/stock. It will seize up and look weird before smoothing out, that's the roux soaking up the liquid, just keep adding broth and whisking until the gravy is liquidy and smooth.
2 cups chicken stock
Reduce the heat to medium low and let the gravy simmer, stirring occasionally so nothing burns to the bottom, for about 5-10 minutes OR until the gravy is thick enough to coat the back of a spoon and stay separated when you swipe a finger down. If your gravy looks too thick, whisk in a bit more broth; if it’s too thin, simmer a few minutes longer.
Stir in the Worcestershire sauce for added umami and taste for salt and pepper. Season as needed, then whisk in the pat of butter to finish the gravy.
1 teaspoon worcestershire sauce, kosher salt and black pepper, 1 tablespoon unsalted butter
For perfectly silky smooth gravy, strain it again through a mesh sieve into a measuring cup or your serving container.