Preheat the oven to 425°F (218°C).
Line a 15x10x1-inch baking pan with foil and lightly grease the foil.
In a small bowl, mix the chopped pistachios, brown sugar, lemon juice, dried dill, and coarsely ground black pepper until combined.
Place the salmon fillets in the prepared pan, skin-side down if present, spacing them evenly.
Spoon the pistachio mixture evenly over the tops of the fillets and gently press it to form a crust.
Bake the salmon about 6 to 8 minutes per 1/2-inch of thickness, typically 12 minutes for average fillets, or until the fish flakes easily with a fork.
Remove from the oven and serve.