Fish-and-Chips

INGREDIENTS

• Vegetable oil, for deep-frying
• 6 cups all-purpose flour
• 3 (12-ounce) cans soda water
• 1 tablespoon freshly ground black pepper, plus more for seasoning
• 3 tablespoons baking powder
• 1 tablespoon kosher salt, plus more for seasoning
• 3 large eggs, lightly beaten
• 6 large russet potatoes
• 6 cod fillets, sliced diagonally into 1/2-inch-wide strips
• 1 to 2 cups rice flour