Hundreds of coffee beans tumble inside a tall metal machine at Broadway Roasting Company in Kansas City, Missouri.
Co-owner Jon Cates and his team, equipped with stopwatches and clipboards, watch closely to make sure the beans roast for just the right amount of time.
“At this point, it’s like seconds could make a huge difference on the flavor of the coffee,” Cates said, as the beans approached the end of their cycle…