A Peruvian criollo classic of golden fish under vinegar-bright onions and native chiles. Bonito stays firm beneath a red, tangy, aromatic escabeche, while sweet potato and egg round out each bite. Bold and juicy, it is the kind of dish that keeps everyone reaching back to the platter.
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Place the sweet potato and eggs in a pot and cover with the water. Bring to a boil; from that point cook the eggs for 10 minutes and remove them, while the sweet potato continues for 8 to 12 minutes more, until a knife slides into the center without resistance. Peel both once cool enough to handle safely and set aside.
While the sides cook, cut the red onion into thick feathers. Finely chop part of the yellow chile and cut the rest into strips. Pat the bonito very dry, divide it into four portions, remove any visible bones, and season with part of the salt, black pepper, and cumin; the surface should be dry before flouring so it browns instead of steaming.
Coat the bonito lightly in the flour and shake off the excess. Heat most of the oil over medium-high heat and carefully add the fish without crowding the pan. Fry for 3 to 4 minutes on the first side and 2 to 3 minutes on the second, until it has a firm golden crust and the center is opaque and flakes when pressed. Remove with tongs and drain on absorbent paper.
Discard the used frying oil and return the pan to the heat with the remaining oil. Add the garlic and finely chopped yellow chile; cook for 30 seconds, then stir in the ají panca paste, oregano, and the remaining black pepper and cumin. Cook over medium heat for 2 minutes, stirring, until the base looks deep red and glossy with no raw-garlic aroma.
Pour in the red wine vinegar and let it boil for 30 seconds; immediately add the red onion, yellow chile strips, and remaining salt. Cook for 3 to 4 minutes over medium-high heat, stirring gently, until the onion is glossy and flexible on the outside but still firm to the bite. Take it off the heat at that point: the escabeche should stay juicy and distinctly tangy, not collapse into soft onions.
Arrange the fish on the plates and spoon the hot escabeche over it, leaving plenty of onion on top of each portion. Serve with sliced sweet potato, halved or quartered egg, and black olives. If the fish is still firm, the onion keeps some bite, and the sauce wakes up the palate with vinegar and chile, it came out exactly as it should. Time to eat! 😌
