-
Combine turkey wings, peppercorns, thyme sprigs, carrot, celery, onion wedges, and bay leaf in a programmable pressure multicooker (such as Instant Pot). Pour 22/3 cups water over mixture. Cover cooker with lid, and lock in place. Turn steam release handle to SEALING position. Select MANUAL/PRESSURE COOK setting. Select HIGH pressure for 1 hour. (It will take about 14 minutes for cooker to come up to pressure before cooking begins.) When program ends, let pressure release naturally for 10 minutes. Carefully turn steam release handle to VENTING position, and let steam fully escape. (Float valve will drop.) Remove lid from cooker.
-
Using a slotted spoon, remove solids from stock in cooker; discard. Pour stock through a fine wire-mesh strainer into a large heatproof measuring cup. Let cool until fat rises to the top, about 15 minutes. Using a spoon, skim fat layer into a small bowl; there should be about 2 tablespoons Add enough butter to skimmed fat to measure 4 tablespoons.
-
Heat a medium skillet over medium. Add skimmed fat–butter mixture; cook, undisturbed, until butter melts. Add flour; cook, whisking often, until mixture turns the color of peanut butter and smells like fried chicken, about 5 minutes. Gradually whisk in strained stock and Madeira. Stir in thyme leaves and pepper. Cook, whisking often, until mixture comes to a boil. Continue cooking, whisking often, until thickened, 3 to 5 minutes. Remove from heat.
