If you are making the miso roasted tofu, start by preheating the oven to 400 degrees(F).
Once you have drained and pressed the tofu, in a large mixing bowl, whisk together the sesame oil, rice wine vinegar, tamari and miso. Whisk until there are non lumps of miso left.
Cut the block of tofu into cubes, add them to the bowl and toss them in the sauce.
Pour the tofu out, sauce and all, onto a large sheet pan lined with parchment paper or a silicone mat. Bake for 15 to 20 minutes or until golden brown and firm.
While the tofu bakes, make the soup. In a large soup pot combine the vegetable broth and water. Heat on medium high, bring to a simmer, then add the gingery miso sauce or miso paste, and the dried shiitakes if using.
Stir to combine, bring back to a simmer, reduce heat to medium low and let simmer for 10 to 15 minutes.
Turn off the heat, add the nori and stir.
Taste and add as much salt as needed, I definitely think you need to add salt, but the miso and nori are salty, so I like to taste it first.
Once the tofu is done, pour the soup into bowls, top with the roasted tofu, scallions or chives and enjoy!
If you are using silken tofu instead, add it at the end with nori.