Meanwhile, separate tortillas and make 2 stacks of 6. Wrap each stack in foil and heat in oven 12 to 15 minutes. While tortillas warm, stir together flour and salt in a large bowl, then stir in beer (batter will be thick). Gently stir fish into batter to coat. Lift each piece of fish out of batter, wiping any excess off on side of bowl, and fry fish in batches, turning once or twice, until golden, 4 to 5 minutes. Drain on paper towels
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