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In a large glass bowl, combine the fish, lime juice and onion. The juice should completely cover the fish; if not, add a little more. Cover with cling film and place in the fridge for 1 hr 30 mins.
Remove the fish and onion from the lime juice (discard the juice) and place in a bowl. Add the olives, chilies, tomatoes, coriander and olive oil, stir gently, then season with a good pinch of salt and sugar. This can be made a couple of hours in advance and stored in the fridge. Serve with tortilla chips to scoop up the ceviche and enjoy with a glass of cold beer.