Deep-Fried Blackened Catfish with Homemade Tartar Sauce

Ingredients

• 4 (6-ounce) catfish fillets (170 g each)
• 1 cup all-purpose flour (120 g)
• 1 cup buttermilk (240 ml)
• 2 tablespoons Cajun seasoning (30 g)
• 1 teaspoon salt (5 g)
• ½ teaspoon black pepper (2 g)
• Vegetable oil for frying (as needed)
• 1 cup mayonnaise (240 g)
• 2 tablespoons dill pickle relish (30 g)
• 1 tablespoon lemon juice (15 ml)
• 1 teaspoon Dijon mustard (5 g)
• Salt and pepper to taste