Preheat outdoor grill if using to medium high. Prepare hot grill with cooking spray. Indoors, use a large skillet rather than a grill pan and preheat with a drizzle of extra-virgin olive oil to medium-high heat.
Place salmon in food processor and pulse to coarse grind meat to form burgers. Transfer fish to a mixing bowl and season with grill seasoning, poppy seeds, sesame seeds, and dill. Mix and form 4 patties. Drizzle the burgers with extra-virgin olive oil.
Cook burgers 3 minutes on each side for a pink center, 4 to 5 minutes on each side for fully cooked fish.
While burgers cook, combine in a bowl the cream cheese and the scallions and fold in sour cream and lemon juice.
Top the burgers with lettuce, tomato, onion and sauce on crusty, toasted buns.
Recipe courtesy of Rachael Ray, 2008