Season the fish with salt, pepper and cumin, and pass through the flour.
Heat half the olive oil in a frying pan over medium heat. Fry the fish on both sides, until golden (abour 3-5 minutes). Reserve.
Bring water to a boil in a small saucepan, and blanch the onion for 1 minute. Drain.
Heat the rest of the oil in a small sautee pan over medium heat. Sautee the garlic and chili paste for 2-3 minutes. Then add the onion, and vinegar, and season with salt and pepper. Simmer for about 5 minutes (Add 2-4 tablespoons water if it dries up).
Cover the fish with the onion mixture, put in a sealed container, and leave it in the fridge for as long as possible (overnight is best).
Serve over a lettuce leave, and decorate with hard boiled egg slices, and black olives.
Recipe by PERU DELIGHTS at https://perudelights.com/fish-escabeche-a-summer-appetizer-with-spanish-roots/