So ubiquitous as to be rendered almost invisible, the sticky bottles of soy sauce that decorate every table, counter and shelf in Japan are never far from reach. Both an ingredient and a condiment, there isn’t a chef in the land who would begrudge a diner a dash of the sleek black sauce – be it at a Michelin-starred sushi restaurant or a back street ramen joint. While the bottles are often slung behind stacked menus, their everyday presence is no sign that their contents should be underestimated. As common as table salt but infinitely more complex, the sweet, salty mix offers a glimpse of the sought-after umami flavor Japan is famous for.