Soak the dried seaweed in cold water, then rinse thoroughly.
Cut the tofu into bite-sized pieces.
Pour water into a pot and bring to a boil.
Add the soaked seaweed and boil briefly.
Add miso paste and minced garlic, and dissolve well.
Add tofu, soy sauce, and pepper; simmer for about 5 minutes.
Serve the finished soup in a bowl.