INGREDIENTS
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1 large egg yolk
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2 tablespoons malt vinegar, divided
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1 cup vegetable oil
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Kosher salt, freshly ground pepper
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Vegetable oil (for frying; about 4 cups)
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2 cups all-purpose flour
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2 teaspoons baking powder
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1 teaspoon baking soda
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1 teaspoon kosher salt plus more
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1/2 teaspoon freshly ground black pepper plus more
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12 ounces (or more) chilled light lager
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1 cup chilled club soda
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1 tablespoon malt vinegar
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1 cup corn flour or all-purpose flour
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1 1/2 pounds cod, haddock or pollack, cut into long, 1 1/2"-wide strips
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French fries (for serving)
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Old Bay seasoning, flaky sea salt (such as Maldon), and chopped fresh dill
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Lemon wedges (for serving)
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Special equipment: A deep-fry thermometer
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Ingredient info: Corn flour, which is more finely ground than cornmeal, is available at Latin markets, natural foods stores, and bobsredmill.com.