Prepare tartar sauce by combining all sauce ingredients in a small bowl. Set in the fridge to marry while you make the fish and chips.
Cut potatoes into thick chips (about ½-inch wide, like steak fries) and soak in cold water for 15-30 minutes. Change the water half way through.
Drain and DRY the potatoes thoroughly. Toss with 2 teaspoons olive or avocado oil, salt, and pepper.
Preheat air fryer to 380°F. Cook chips in batches for 12-15 minutes, flipping halfway through. Keep warm in a 200°F oven or cover loosely with foil to keep warm.
While the fries cook, bread the fish. Set up breading station: flour mixture in one dish, beaten eggs + 1 T malt vinegar in second dish, and breadcrumb mixture in third dish.
PAT DRY!! Do not skip this step or you will have soggy fish. Cut the filets into even pieces around 3 inches wide. Coat in flour, then egg, then breadcrumb mixture. Lay onto plate until the air fryer is heated.
Lay the fish into the preheated air fryer. Use a parchment liner to cut down on mess. Spray top with oil. Cook breaded fish in air fryer at 380°F for 10 minutes total, flipping halfway through and spraying the flipped side with oil. Check for internal temp of 145°F.
Wipe out the air fryer and throw the chips back in at 400° F for a few minutes if needed. Serve fish and chips with tartar sauce, malt vinegar, lemon wedges, and a sprinkle of salt.
Notes
It is very important to make sure the fish is dry before breading. Use paper towels.