Farmshelf, an indoor farm that lets you grow lettuce and herbs, is sprouting up at restaurants, corporate kitchens and food halls around the country Farm-to-table is taking root in corporate offices. Farmshelf, a Brooklyn-based startup, has begun selling indoor farm kits that grow food like lettuce and herbs using hydroponics — a method of growing plants in a water-based, nutrient-rich solution instead of soil. And the product is so popular that corporate cafeterias, restaurants and food halls around the U.S. are dropping $7,000 apiece to buy in. “We’re building the Lego blocks to grow food anywhere,” founder and CEO Andrew...