This hearty vegan dish uses miso and soy to add a tremendous amount of depth and flavor to a relatively quick, one-pot mushroom barley soup. Quartering the mushrooms allows them to retain bite, but you can thinly slice them if you’d prefer everything to be soft and tender. Resist the urge to salt heavily during the bulk of the cooking, as the miso and soy — both sodium-heavy ingredients — will be added at the end to bring the soup together. This is a soup that will thicken, so add more water…