The best cook on the tour?
I'd say it's Djokovic. He can do roasting impressively on a constant basis. Söderling also has shown he could be a good chef.
Federer sometimes has trobles in roasting but in 2010 and 2011 he was impressive at London's O2.
Then there are guys like Roastsol, Darcis, Zeballos, and Ballsdig who don't get many chances to show their roasting abilities but have been proved to be excellent chefs.
2014 Australian Open Champion | 2014 Monte Carlo Masters Champion | 2015 French Open Champion
2008 Paris Masters Champion | 2014 Toronto Masters Champion