"Frying at home is a drag, unless you happen to be outdoors, holding a beer, and not worrying about spills or smelling up the house...."
INGREDIENTS
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1/2 cup mayonnaise
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1/4 cup finely grated lemon zest
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2 Tbsp. fresh lemon juice
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2 Tbsp. sweet relish
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1 Tbsp. chopped drained capers
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1 Tbsp. Dijon mustard
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1 small garlic clove, finely grated
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Kosher salt
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2 Tbsp. Old Bay seasoning
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1 tsp. baking powder
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1 tsp. cayenne pepper
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3/4 cup all-purpose flour, divided
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3/4 cup cornstarch, divided
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5–6 mini seedless or Persian cucumbers
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1/3 cup seasoned rice vinegar
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8 potato rolls
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2 Tbsp. unsalted butter, melted
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1 large egg, beaten to blend
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3/4 cup light beer
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8 (4-oz.) pieces skinless, boneless firm whitefish fillets (3/4"–1" thick)
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1/2 cup very coarsely chopped dill
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Vegetable oil (for frying; about 6 cups)
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Kosher salt
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Lettuce leaves (for serving)
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A deep-fry thermometer