Add dried shiitakes to a small pot or bowl, and add with boiling water. Cover the bowl/pot with a plate or lid.
Let sit until shiitakes are rehydrated ~an hour.
Strain the stock into a pot (sometimes dried shiitake leaves loose sediments/grit).
If using shiitakes in soup, thinly slice them and add them to the shiitake stock.
Bring to a boil over medium heat, add in the tofu and seaweed. Let simmer for a minute and turn off heat.
Mix in miso paste, soy sauce, shaoxing wine. Adjust seasoning to taste.
Top with scallions if desired, enjoy!