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1
Toss cabbage and onion with 1 teaspoon kosher salt and lots of black pepper and set aside. Meanwhile, combine vinegar, mustard, mayonnaise, and sugar in a medium bowl and set aside for at least 15 minutes.
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2
Meanwhile,
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3
Combine mayonnaise, relish, capers, sugar, and dijon mustard. Set aside.
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4
To finish slaw, pick up salted cabbage and onions in batches with your bare hands and squeeze out excess moisture. Transfer to bowl with dressing. Discard excess liquid. Toss slaw to combine and season to taste with more salt and pepper if desired.
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5
Preheat oil to 350u00b0F in a large wok, Dutch oven, or deep fryer. Combine 1 cup of flour, cornstarch, 1 teaspoon kosher salt, 1/2 teaspoon ground black pepper, baking powder, and paprika in a large bowl and whisk to combine. Place remaining flour in a large bowl. Add fish and toss to coat.
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6
Add beer to flour/cornstarch mixture and whisk until a batter is just formed. A few small lumps of dry flour are ok. Transfer fish to batter and turn to coat. Working one piece at a time, pick up the fish and allow excess batter to drip back into the bowl. Return it to the bowl with dry flour and quickly coat it on both sides. Pick up the fish with your hands, tossing it gently in your open finger to get rid of excess flour. Carefully lower it into the hot oil. Repeat with remaining fish.
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7
Cook, shaking the pan gently and agitating the oil with a wire mesh spider or tongs constantly, turning the fish until it is golden brown and crisp on all sides, about 8 minutes total. Transfer to a paper towel-lined plate and season immediately with salt.
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8
To serve, place a small pile of slaw on the bottom half of each bun. Top with a piece of fish and a dollop of tartar sauce. Close buns. Serve with extra slaw and sauce on the side.
