Add water and hondashi to a pot and bring to a slow boil under medium heat.
Break up the wakame into tiny pieces using your fingers or scissors and add to the pot. Add tofu and bring to a simmer.
Turn off the heat and add the miso. Use a spoon or spatula to gently mix until all the miso has dissolved. If available, use a fine mesh strainer to ensure there are no miso clumps.