Add all the ingredients for salmon except the buns. Pulse a few times until the salmon is chopped into small pieces, but not into a smooth paste. Divide the salmon into 4 equal portions and roll into a patty.
Blend all the ingredients for the sauce in a small mixing bowl and set aside.
Mix the slaw veggies and set aside. Toast the brioche buns.
Spray a little olive oil on a hot skillet and cook the burgers until just about done, do not overcook, it will dry very easily.
Assemble
on the bottom of the burger bun place a few slices of avocado, place some slaw and salmon burger patty. Top it with some sauce, finally place the top bun and serve.