Celebrated South African chef and cooking-show judge Keegan Maistry relishes the freedom to express himself at one of Johannesburg's premier hotels. The executive head chef of the Radisson Red Johannesburg-Rosebank is inspired by an environment that cherishes creativity as much asit does happy travellers and the proof is no doubt in the pudding. The 38-year-old, who joined the team last year,has set patrons' tongues wagging with a menuspecially curated for this winter season. Maistry shared kitchens with the world's finest…