1Poach fish for 10 minutes. Cut into bite-size pieces and put in bowl. Add lemon, onion, olives and pimento. Toss together.
In another bowl: combine lemon juice, oil, vinegar, spices and herbs. Stir into fish mixture. Try not to break up the fish too much. Cover and refrigerate for at least 2 hours, stirring once or twice. Stir just before serving.