Preheat the oven to 400 degrees F (200 degrees C). Fill a large skillet with about 1 inch of water and bring to a boil. Poach fish just until cooked on the outside, about 2 minutes per side.
Transfer fillets to a broiler pan.
In a small bowl, stir together the miso paste, sake, brown sugar, sesame seeds, sesame oil, water, salad dressing and rice vinegar.
Spread this over the tops of the salmon fillets.
Bake for 15 minutes in the preheated oven, or until almost cooked through. Switch the oven to broil, and broil until the top is browned and bubbly, about 5 more minutes.
