Cook's Illustrated on Instagram: "Prime rib perfection comes down to three rules, and @chef.eric.explains breaks them all down: salt twice, sear twice, and know exactly when to turn off your oven. A slow, gentle roast builds tenderness, a final broiler sear delivers that deep, beefy crust, and a last hit of flaky salt makes every slice pop. This is the method we trust for a showstopping holiday roast."