01 -
Warm your frying oil in a sturdy pot to hold steady at 375°F.
02 -
In a bowl, mix mayo, parsley, pickles, lemon juice, Dijon, and capers. Add salt and pepper last.
03 -
Cut fish fillets to fit buns, roughly 4-6 oz each. Lightly season, then rest on a wire rack over a pan.
04 -
In one bowl, mix flour and Old Bay for a dry coat. In another, whisk flour, egg, sparkling water, and added spices for a thin batter.
05 -
Dip fish pieces in dry flour first, then dunk into the batter. Let excess drip off before frying.
06 -
Cook each fish piece until it's a crispy golden brown, about 2-3 minutes on each side. Set on a wire rack to cool slightly.
07 -
Hold buns over steaming water for about 10 seconds to soften.
08 -
Start with a bottom bun, spread on tartar, lay on fried fish, add cheddar, and a touch more tartar. Top with the other bun.