In a mixing bowl, combine the flour, baking powder, salt, and black pepper.

In a separate bowl, whisk together the cold water and beaten egg.

Gradually add the wet ingredients to the dry ingredients, stirring until just combined.

Heat oil in a frying pan over medium-high heat until it reaches 350°F (175°C).

Dip the fish fillets into the batter, allowing excess to drip off.

Carefully place the battered fish into the hot oil and fry for 3-5 minutes on each side until golden brown.

Remove the fish and drain on paper towels before serving.