Fish And Chips With Malt Vinegar Mayonnaise

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   ["Whisk egg yolk and 1 tablespoon vinegar in a small bowl. Whisking constantly, slowly drizzle in oil, drop by drop at first, until mayonnaise is thickened and smooth. Add remaining 1 tablespoon vinegar; season with salt and pepper. Cover and chill.", "DO AHEAD:", "Fit a large pot with thermometer; pour in oil to measure 3"". Heat over medium-high heat until thermometer registers 375u00b0F.", "Meanwhile, whisk all-purpose flour, baking powder, baking soda, 1 teaspoon kosher salt, and 1/2 teaspoon pepper in a large bowl. Whisking constantly, slowly add beer, club soda, and vinegar, adding more beer if batter is too thick (it should be the consistency of thin pancake batter).", "Place corn flour in a shallow bowl. Season fish with kosher salt and pepper. Dredge fish in corn flour, shaking off excess, then dip in batter, letting excess drip back into bowl. Working in batches and returning oil to 375u00b0F between batches, fry fish until golden brown and crisp, about 2 minutes per side. Transfer to paper towel-lined baking sheet.", "Season fish and fries with Old Bay, sea salt, and dill; serve with malt vinegar mayonnaise and lemon wedges."]

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