Remove any bones in the fish, then cut into 1cm (1/2in) cubes. Put into a large non-metallic bowl and add lemon juice, onion and 1/4tsp salt (if using). Leave to ‘cook’ for 5-30min (depending on whether you prefer fish more raw or ‘cooked’ through), gently stirring from time to time.
Step 2
To serve, lift fish and onions out of liquid (reserve liquid); arrange on a large platter. Dot around tomatoes, then scatter over chilli, coriander, cress and freshly ground black pepper (if using). Spoon over a little reserved lemon liquid (discard remainder) and drizzle with extra virgin oil.
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