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6 to 8
Easy
Mero, or red grouper, is a tropical sea bass. Mediterranean grouper is sometimes available in England, but sea bass, striped bass, haddock or mackerel are all suitable for this dish.
Cut the fish fillets into 1½-inch pieces and season with salt. Heat 2 or 3 tablespoons of the olive oil in a frying pan and fry the pieces of fish. Lift out and place in a deep glass or porcelain bowl.
Combine the onions, garlic, bay leaves, peppercorns and vinegar in a saucepan and simmer until the onion is tender. Cool. Add the remaining olive oil and the olives and pour over the fish