Preheat oven to 350 ̊.
Sprinkle Cajun seasoning, salt and pepper on fillets. Top with lemon slices and bake for 15-20 minutes, until fish starts to flake.
While fish is cooking, combine mayonnaise, sour cream and dill. If needed, add more dill until desired flavor is reached.
Cover cooked fillets with sauce mixture and serve immediately with a rice pilaf.