Preheat your oven to 425 degrees.
Line a baking pan with parchment Paper.
Season the salmon fillets with salt and pepper and place them on the baking sheet.
In the bowl of a food processor add the pistachios and process for 45 seconds. You don’t want the pistachios too finely ground. Remove to a mixing bowl.
Add the polenta, cheese, garlic, dill, oil, salt and pepper to the bowl and mix with a spoon until the mixture is the consistency of wet sand.
Spread evenly over the salmon fillets and bake until the fish is flaky, about 25-30 minutes.