Peel the potatoes and cut them into thick chips.

Soak the cut chips in cold water for at least 30 minutes.

In a large pot, heat vegetable oil to 350°F (175°C).

In a bowl, whisk together flour, baking powder, and a pinch of salt.

Slowly add cold sparkling water until you achieve a smooth batter.

Carefully add the soaked chips to the hot oil in batches and fry for about 5-7 minutes until golden and crispy.

Use a slotted spoon to remove the chips and let them drain on paper towels.

Dip the fish fillets into the batter and gently place them in the hot oil.

Fry for about 4-5 minutes or until golden brown.

Remove the fish with a slotted spoon and let it drain on paper towels.