_Amy Zitelman co-founded Soom Foods with her sisters Shelby and Amy in 2013. Good timing: they focused on top-quality tahini just as the Middle Eastern ingredient craze — sumac! silan! zaatar! — was spreading across restaurant dining rooms and supermarket shelves. Philadelphia chef Michael Solomonov of Zahav and, well, everything, gave them their first order, and they’ve been selling hundreds of thousands pounds of the stuff to consumers and restaurants ever since.