No wonder he fled to LA the moment he got his green card. As chef at Ma Maison, he began to rub shoulders with the rich and famous. 'Orson Welles used to come to lunch every day and we talked about food,' he says. 'Once I made him a grilled duck salad with sautéed mushrooms and he liked it so much he ordered another. He told the owner, "If you ever let this guy go, I'll leave with him." ' During his time off, Puck played tennis with his customers Gene Kelly and Sidney Poitier. Then, in 1981, he opened the first Spago at a cost of $500,000, backed by students at his cookery classes (most of whom were lawyers during the day). 'It was a very good investment for them,' he chuckles.
In 1984 he married interior designer Barbara Lazaroff, who helped set up his business and designed several of his restaurants. They divorced in 2003, but Lazaroff is still his business partner, although they don't seem to get on. 'Sometimes there is a reason that divorce is so expensive – because it's worth it,' he jokes. 'But we have children together so we have to live with each other.' (They have two sons, Cameron, 21, and Byron, 16.) In 2007, he married the Ethiopian handbag designer Gelila Assefa, who he met when she was working at Spago; they also have two sons, Oliver, five, and Alexander, three. Although Mrs Puck has the streamlined elegance of someone who exists on lettuce leaves, here's hoping, for the sake of marital harmony, that she appreciates a good dinner. 'I always say to her, "It's crazy to spend money on shoes or diamonds or handbags when you could have truffles,"' says Puck (a man who once spent £13,000 on just such a mushroom for Robert De Niro). 'I could spend $5,000 on a truffle with my eyes shut, and a week later it's gone. But I keep a little piece in my pocket, just for the smell. A simple pizza with white truffle is a perfect thing.' As well-heeled London gastronomes will shortly discover.