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Cut the fish into 1cm cubes, then put in a bowl with the lime juice and zest, a pinch of sugar, the spring onion, chilli and coriander stalks. Toss together, cover and chill in the fridge for 2 hrs.
Stir 1-2 tsp sea salt (enough to taste) and the radishes through the ceviche. Spoon onto a plate, drizzle over the oil and scatter over the garlic chives, if using. Serve with crunchy tortilla chips on the side to scoop up the fish.