Fish Prep and Osmosis
Pat the fish fillets dry with kitchen paper. Sprinkle 1.5 teaspoons of fine sea salt evenly over all sides. Place the fish on a wire rack inside a tray and refrigerate for 15 minutes. Afterward, rinse thoroughly under cold water and pat completely dry with fresh paper towels.
Salting draws out excess internal water and tightens the muscle structure, preventing steam from making the inner batter layer soggy.
The fish flesh should look firmer, slightly translucent, and feel tight rather than flabby.