Diners will soon be able to walk into a San Francisco restaurant and order dishes made with lab-grown pork. The San Francisco headquartered company Mission Barns announced Friday it had received a key regulatory approval from the U.S. Food and Drug Administration which will allow it to bring products like meatballs and bacon made with lab-grown pork fat to U.S. consumers. Italian restaurant Fiorella, which has four locations in San Francisco,…