Make the batter by mixing the flour, cornflour and chopped seaweed in a bowl with a little salt.
Add the ice-cold water and beaten egg white and stir until just mixed: the batter should still be lumpy.
Heat the oil to 180°C/350°F in a deep-fryer or deep pan. Season the seafood and dip each piece into the batter, then drop into the hot oil. You will ha