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1
In a large bowl, toss onion, tomatoes, cilantro, aji amarillo, garlic, and lime juice together until well combined. Season with salt. Let stand, stirring occasionally, until onions soften slightly and turn a brighter pink color, about 10 minutes. Drain well.
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2
Preheat oven to 400u00b0F. In a fryer, medium pot, or wok, heat oil to 350u00b0F, adjusting heat source as needed to maintain temperature.
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3
Meanwhile, add 1 1/2 cups flour to a large bowl with corn starch, baking powder, 1 1/2 teaspoons salt, 3/4 teaspoon ground black pepper, and paprika. Whisk to combine. Add 1 1/2 cups beer, whisking to form a thick batter; some small lumps of flour are okay. In a separate medium bowl, add remaining 3 cups flour.
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4
Dredge white-fleshed fish in flour, shake off excess, and transfer to beer batter, turning to coat. Working 1 piece at a time, pick up the fish and allow excess batter to drip back into the bowl (a wire strainer can be helpful with this). Return it to the bowl with dry flour and quickly coat it on both sides. Repeat with remaining fish. Pick up the fish pieces with your hands, tossing them gently in your open fingers to get rid of excess flour. Carefully lower into the hot oil and fry, agitating and turning frequently, until golden brown outside, about 3 minutes. Transfer fish to large paper towel-lined mixing bowl and season with salt, shaking gently to absorb oil. Transfer fish to a wire rack set over a baking sheet.
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5
Increase oil temperature to 375u00b0F, adjusting heat to maintain temperature. Repeat dredging and battering process with shrimp and fry until golden, 2 to 3 minutes. Transfer to the large mixing bowl lined with fresh paper towels and season with salt, shaking gently to absorb oil. Transfer shrimp to wire rack with fish.
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6
Whisk remaining 1/2 cup beer into batter until thoroughly incorporated (this will thin the batter slightly, making the squid easier to work with). Repeat dredging process with squid, making sure to drain each piece well of batter before the final coating in flour. Fry until golden, about 2 minutes. Transfer to the same large mixing bowl once again lined with fresh paper towels and season with salt. Shake gently to absorb excess oil.
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7
If fried seafood has cooled, set in oven until reheated, about 3 minutes. Mound fried seafood on a plate. Arrange Salsa Criolla on top and serve immediately with fried yuca and its dipping sauce.
