I’m pretty sure Frankie wasn’t talking about sirloins and saddles of lamb but the important word here is RELAX. Every chef I know worth their salt* and every TV chef you watch will all tell you to let cooked meat relax. It is just not important it is imperative ! An impeccably sourced, correctly seasoned piece of meat will be dry and tough if not allowed to rest. Simply after cooking keep a steak warm and covered with foil for 5 minutes before serving. For an average chicken or joint of meat cover with a foil tent and keep in a warm oven for 20 to 25 minutes. The core temperature will actually rise and the meat will reabsorb its natural juices making it tender and tasty. From a duck breast to a glazed ham to a whole side of beef , when allowed to relax the difference is truly amazing.
* In ancient Rome soldiers were paid part of their wages in salt – from which the term salary derives