By Lucretia Munro Brooklyn Beckham has sensationally revealed that he has never been professionally taught how to cook, despite opening his first restaurant in just a few days. According to the eldest son of David and Victoria Beckham, 24, who is married to billionaire heiress Nicola Peltz, he attributes his culinary skills to watching cooking masterclasses. In a recent interview he said: “Unfortunately, I’ve never done, like, a cooking class, but I’m obsessed with watching MasterClass [online classes with experts in their field].” In the interview, Brooklyn who ferries between Los Angeles, Mi…