Rinse the cod fillets under cold water and pat them dry with paper towels. Season both sides with salt, black pepper, and lemon juice. Set aside to marinate for 15 minutes.

Preparation of Batter

Make the Batter

In a mixing bowl, combine the all-purpose flour, cornstarch, baking powder, salt, and black pepper. Gradually whisk in the beer or sparkling water until the batter is smooth and has a thick consistency.

Preparation of Chips

Prepare the Potatoes

Peel the potatoes and cut them into thick wedges or slices. Rinse under cold water and pat dry with a towel. Soak them in cold water for 30 minutes to remove excess starch.

Frying

Fry the Chips

In a large pot, heat vegetable oil over medium-high heat. Once hot, carefully add the soaked potato wedges in batches, frying them for about 5-7 minutes until golden brown. Remove and drain on paper towels. Season with salt.

Fry the Fish

Dip each marinated cod fillet into the batter, allowing the excess to drip off. Carefully place the battered fillets in the hot oil and fry for 4-5 minutes on each side until golden brown and crispy. Remove and drain on paper towels.

Serving

Serve the Dish

Plate the crispy fish alongside the golden chips. Serve with malt vinegar, tartar sauce, and lemon wedges on the side for drizzling.