Instructions

1. Preheat the oven to 425°F (220°C) for the French fries.
2. In a large bowl, soak the cod fillets in buttermilk for at least 30 minutes to tenderize and flavor the fish.
3. Prepare the batter by mixing 1 cup of all-purpose flour, 1 teaspoon of baking powder, and 1 teaspoon of salt in a bowl.
4. In a separate bowl, beat 1 each of large egg and 1 cup of cold sparkling water until well combined.
5. Gradually whisk the egg mixture into the flour mixture until smooth and slightly thickened. Set aside.
6. Peel and cut the potatoes into thick strips to make French fries, then rinse them in cold water to remove excess starch.
7. Pat the potato strips dry with a clean towel, then toss them in a bowl with 2 tablespoons of vegetable oil and a pinch of salt.
8. Spread the potato strips in a single layer on a baking sheet and bake in the preheated oven for 20-25 minutes, flipping halfway through, until golden and crispy.
9. While the fries are baking, heat 1 quart of vegetable oil in a deep fryer or a large pot until it reaches 350°F (175°C).
10. Remove the cod from the buttermilk, allowing excess to drip off, then dip each fillet into the prepared batter, ensuring an even coating.
11. Carefully place the battered cod into the hot oil and fry for about 4-5 minutes per side, or until the fish is golden brown and cooked through.
12. Once cooked, remove the fish from the oil and place it on a paper towel-lined plate to drain excess oil.
13. Serve the hot fried cod alongside the crispy French fries, garnished with 1 each of lemon wedge and 1 each of tartar sauce for dipping.