Farmer Chris Kurth and his wife, chef Ana Sortun, pack the overflowing produce bins inside and outside of their minuscule South End store with hard-to-find sustainable fruits and veggies, like petite 'fairy tale' eggplant and gnarly celery roots, harvested from their 50-acre Siena Farms and supplemented by regional growers; top-notch meats, seafood, dairy products and cookbooks round out the...