Xi’an Famous Foods Runs on Secret Spices

Father and son.

Jason Wang tells Forbes that 85 percent of his intense and intensely popular menu at Xi'an Famous Foods is based on his grandfather's sauce recipes and a proprietary spice blend. Each is made with more than twenty ingredients, and while the mini-empire that includes six Xi'an locations and Biang! in Flushing now attracts 140,000 customers a year and has grown sufficiently big to warrant leasing a round-the-clock, 5,000-square-foot commissary kitchen in Brooklyn, those secret ingredients are still prepped every day at home by Wang's father. [Forbes]