01 - 
                Preheat oil to 350°F in a deep fryer or medium saucepan.
              
              
              
                02 - 
                Combine flour, cornstarch, baking powder, salt, and cayenne pepper in a bowl. Whisk in water until slightly foamy.
              
              
              
                03 - 
                Pat fish dry with paper towels and dip in batter to fully coat each fillet.
              
              
              
                04 - 
                Deep-fry for 3-4 minutes until golden brown. Cook pieces separately if needed.
              
              
              
                05 - 
                Let fish drain on a wire rack before serving.