TIL if you want to make a powdered drink like hot chocolate or cup-a-soup, add a tiny amount of water to the powder and make a paste before adding the hot water to avoid clumping.
But it tastes so much worse than adding a ball of wasabi to the piece and dipping the soy sauce separately if at all. How can you possibly get enough wasabi to really bring out the flavor of the fish without absolutely drowning your sushi in soy sauce? Not every piece should get the same proportion of soy sauce and wasabi either.