Impossible Burgers to Be Sold in Grocery Stores for the First Time.br The soy-based meat substitute will be br available in 27 Gelson’s Markets br throughout Southern California on Friday.br The company plans to expand br grocery sales to the east coast br by the end of the month.br The meatless burger debuted br at chef David Chang’s br Momofuku Nishi 3 years ago.br We wanted the benefit of building a consumer movement in the hands of professional chefs before we began to serve home chefs, CFO David Lee, via CNN Business.