01 - Pat the fish fillets completely dry with paper towels. Season both sides generously with salt and black pepper.
02 - Set up three shallow bowls: place flour in the first bowl, beat eggs with milk in the second bowl, and place breadcrumbs in the third bowl.
03 - Dredge each fillet in flour, shaking off excess. Dip into the egg mixture, allowing excess to drip off, then press firmly into breadcrumbs to coat thoroughly.
04 - In a large skillet, heat about ½ inch of vegetable oil over medium-high heat until shimmering but not smoking.
05 - Fry fish fillets in batches for 3-4 minutes per side until golden brown and cooked through. Transfer to a wire rack or paper towels to drain excess oil.
06 - Combine mayonnaise, Dijon mustard, chopped pickles, capers, lemon juice, and parsley in a small bowl. Season with salt and pepper. Mix thoroughly and refrigerate until ready to serve.
07 - Serve fried fish immediately with chilled tartar sauce on the side. Accompany with lemon wedges if desired.