Rehydrate the Wakame: Place the dried wakame in a small bowl and cover with lukewarm water.
Let it sit for 5-10 minutes until it has fully expanded, then drain any excess water.
Warm the Dashi: In a medium pot, gently warm the vegetarian dashi over medium heat until it is hot and steaming, but do not let it come to a full boil.
Dissolve the Miso: Place the miso paste in a small bowl. Ladle about ½ cup of the hot dashi into the bowl and whisk until the miso is completely smooth and dissolved.
Pour the thinned miso mixture back into the pot and stir gently to combine.
Assemble and Serve: Divide the rehydrated wakame and cubed tofu evenly among four serving bowls. Carefully ladle the hot miso broth over the tofu and wakame.
Serve immediately.