In a large bowl, whisk together the flour, egg, ice-cold water, and salt until smooth.

Heat vegetable oil in a deep pan or pot to 350°F (175°C).

Dip the vegetables and seafood into the batter, ensuring each piece is well coated.

Carefully place the battered vegetables and seafood into the hot oil, frying until golden brown and crispy.

Remove from oil and drain on a paper towel-lined plate.

Serve hot with dipping sauce or soy sauce.