Swirl a few tablespoons of cold butter into a pan sauce before you serve it — you’ll be amazed by how it improves the texture. Cut the butter into small pieces and whisk them in a few at a time, then remove the sauce from the heat and cover to keep warm. If the sauce gets too hot, the butter can separate and make the sauce oily. If this happens, just whisk in a few tablespoons of water.
(Photograph by Christopher Testani)