Blend the salmon in the food processor, then mix in the cajun spice, salt, and pepper. Then, divide them into portions. Place each portion on a piece of parchment paper and form two flat 4-inch patties. Then, place parchment patties on a sheet pan in a single layer. Put them in the freezer to slightly harden and keep their form. Then, when you are ready to sear, make sure the pan is really hot, almost smoking. Drop the patties in the oil.  Then, flip them into the pan if they are semi-frozen, then peel the parchment paper black. Finally, reduce the heat to prevent burning, and cook on both sides for 2 to 5 minutes each. In just a little time, you got yourself some delicious spiced patties.