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1
Combine fish pieces with garlic, lime juice, salt, and crushed pepper in a bowl. Marinate 30 minutes at room temperature.
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2
Whisk together flour, chile powder, and crumbled oregano in a shallow dish.
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3
Pour lard or oil into a heavy skillet to a depth of about 1.25 cm (½ inch). Heat to 175–190°C (350–375°F).
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4
Lift fish from marinade, letting excess liquid fall away. Dredge each piece in the seasoned flour, coating all surfaces, and shake off any loose excess.
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5
Fry in uncrowded batches, turning occasionally, until thoroughly crisp and deep golden brown — about 10 minutes per batch. Do not rush.
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6
Remove to a wire rack. Drain well. Serve at once.