To make broth, mix miso with dashi and add ginger. On medium heat, bring to a simmer. Let simmer for 5 minutes then remove ginger. In a small bowl, make a paste with the vinegar and wasabi. Whisk in soy, scallions and sugar. Check for seasoning. Toss vinaigrette with enoki and tatsoi. In soup bowls, gently place 1 slice of tofu and ladle the broth on top. Place a small mound of salad on the tofu.