Shell and devein the prawns and sprinkle with half the lime juice. Wash and dry the salad leaves.
To make the mango salsa, mix the mango, spanish onion, chilli, coriander and remaining lime juice in a bowl.
Arrange the salad greens on a plate, spoon over the mango salsa and top with slices of avocado and king prawns. Top with the pepper and garnish each serving with a sprig of coriander.