An emblematic breakfast from Callao: crusty French bread filled with freshly fried battered pejerrey, crisp lettuce, and a bright salsa criolla of red onion, ají limo, and lime. The fish stays golden and light while the salsa brings the sharp acidity that wakes up the whole sandwich. A true Callao classic meant to be eaten hot and immediately.

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Check the pejerrey and remove any visible bones with tweezers; pat the fish thoroughly dry and keep it chilled while you prepare everything else. The fish should reach the batter with a dry, firm surface.
Slice the red onion into thin feathers and finely chop the ají limo and cilantro. Toss them with the lime juice and about one third of the salt for 30 seconds, then rest for 10 minutes. The salsa should remain bright, tangy, and crisp, not fully wilted.
Season the pejerrey with roughly another third of the salt and half of the pepper. Use one quarter of the flour to dust the fish very lightly on both sides, shaking off all excess; this thin layer helps the batter adhere without becoming heavy.
Beat the eggs just until the whites and yolks combine. Add the water, remaining flour, remaining pepper, and another portion of the salt, whisking until the batter is creamy and fluid, able to coat a spoon in a thin film without becoming pasty. Rest it for 3 minutes.
Heat the vegetable oil in a wide skillet to 175 to 180°C. Dip each pejerrey in the batter, let the excess drip off for a few seconds, and fry in batches for about 2 minutes per side, until the coating is golden and crisp and the fish is opaque and flakes easily. Drain on paper towels for only 1 minute so it stays crisp.
Split the French rolls without cutting all the way through and place a layer of lettuce on the bottom. Divide the freshly fried pejerrey between them—roughly 3 to 4 pieces per sandwich, depending on size—and finish generously with salsa criolla. The lettuce sits between the bread and filling to help keep the crust firm.
Serve immediately while the bread is still crusty and the pejerrey is hot. The proper bite combines firm bread, light crisp fish, fresh lettuce, and citrusy onion all at once. And that's it—a true Callao breakfast needs no fancy hour, just an appetite and preferably the sea nearby.