Ingredients:
* 454 9/1 lb frozen prawns, defrosted (24 Sins on Green)
* juice of 1 lemon
* 1 small melon, e.g. ogen or charentais
* 1 iceberg lettuce, trimmed, washed and shredded
* 142 g/5 oz very low fat natural yogurt
* 1 small bunch fresh mint, chopped
* salt and freshly ground black pepper
* 2 teaspoons snipped chives