My brother went to Japan recently, and brought me back a cool new contraption.. a sieve for making miso soup!
Simply place the miso paste in the sieve and then lower it down into the soup. Paddle around with the little spatula and the miso is dissolved and distributed evenly. It's so much easier and effective than just trying to stir the paste around into the soup. I always end up with one big salty spoonful at the end.