Step 1

Shake lime juice, fish sauce, sugar and chilli together in a screw-top jar. Toss mango in a bowl with dressing.

Step 2

Place fish on a plate in a steamer over a pan of simmering water. Steam for about 5 minutes until cooked but still slightly rare in the centre. Add herbs to mango, place a piece of fish on each serving plate, top with salad and sprinkle with nuts. Serve with lime wedges.