Budget-conscious celebrity chef Jamie Oliver has been hired to cook for G-20 leaders in London next week, nearly a year after they provoked outrage by eating an eight-course meal while discussing the global food crisis. Oliver’s company will feed the leader’s at Prime Minister Gordon Brown’s residence, 10 Downing Street. Leaders at last July’s G-8 meeting drew heavy criticism for enjoying an eight-course meal featuring 19 dishes while they were meant to be discussing how to ease global food shortages