When Chef Kelvin Cheung, who quit Colaba eatery Ellipsis in July this year, chose Mumbai over Chicago, the city rejoiced. For his week-old gastro pub, One Street Over, at Bandra, he brought onboard 31-year-old Chef Boo Kwang Kim, who he mentored when the latter was in culinary school. Kim will run operations for Cheung, when he is busy opening up other projects slated to open next year. We catch Kim on the phone the day he is flying back home to Chicago for the holidays. Excerpts from the interview: