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Add hearts of palm, panko, seaweed, salt, and pepper to the bowl of a food processor. Pulse a few times until ingredients are combined. The mixture should be a chunky texture. Shape the mixture into 8 “fish sticks” and squeeze out any excess liquid. Place on a parchment-lined baking sheet and let chill for 30 minutes.
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To make the batter, combine the flax seed with water in a small bowl and let sit until thickened, about 5 minutes. In a medium bowl, whisk together flour, garlic powder, paprika, and salt. Stir in the thickened flax egg and slowly mix in the beer.
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Heat enough oil to cover 1 inch of a small cast iron skillet. Once the oil is hot, coat the “fish sticks” in the batter. Working in batches, gently place 3-4 pieces in hot oil and fry for about 2 minutes, flipping once.
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Remove from oil and place on a paper towel to absorb excess oil.
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Warm tortillas. Assemble tacos with vegan fish sticks, avocado, cabbage, and cilantro. Drizzle with sweet chili sauce and serve with lime wedges.