1) Peel, devein and roughly chop half the prawns. Place in a bowl with mango and avocado.
2) Grate the zest of half a lime, then juice both limes. Place lime zest and juice in a small bowl with the coriander, chilli, honey and oil. Whisk to combine and season well. Pour over prawn mixture and toss to combine.
3) Divide lettuce among plates, fill with the salad and serve with the remaining prawns and lime wedges.