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1
Soak peas in water to cover by 2 inches at least 8 hours and up to 12.
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2
Drain in a colander.
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3
Put oven rack in middle position and preheat oven to 250F.
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4
Line a baking sheet with wax paper.
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5
Pulse peas, onion, cilantro, peppers, and 1 teaspoon salt in a food processor until finely chopped, then transfer to a bowl.
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6
Toss shrimp with remaining 1/4 teaspoon salt.
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7
Press a scant tablespoon pea mixture around each shrimp, encasing shrimp in a thin even layer but leaving tail (and shell) exposed, then transfer to baking sheet.
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8
Put eggs and panko in 2 separate shallow bowls.
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9
Holding 1 shrimp by the tail, dip coated portion of shrimp first into egg, letting excess drip off, and then into crumbs, returning shrimp to baking sheet.
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10
Coat remaining shrimp in same manner.
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11
Line another baking sheet with paper towels.
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12
Heat 1 1/4 inches oil in a 5- to 6-quart heavy pot (9 to 10 inches in diameter) until it registers 350F on thermometer.
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13
Fry croquettes in 4 batches, turning over once or twice, until deep golden, 2 to 3 minutes per batch, transferring with a slotted spoon to paper-towel-lined baking sheet.
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14
Keep fried croquettes warm in oven while frying remainder, returning oil to 350F between batches.
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15
Serve croquettes immediately.