Miso from Massachusetts? Hai! South River Miso has a little photo tour of their miso production facilities. The navigation is awkward; you have to use the dropdown menu at the top of the page. But make sure you make it to the last step of the process where, to my surprise, the beans are mashed by human feet encased in two pairs of organic cotton socks and plastic (yes, the feet are attached to humans, called treaders).