Method 
1. Combine the mango and avocado in a bowl, mix with lime juice and set aside.
2. Heat a frying pan over medium heat, add the butter, when melted sauté the garlic and chilli. Add prawns and cook.
3. Heat another oiled frying pan over a medium heat, cook the fillet skin side down for about 3 minutes, turn and cook for a further few minutes or until cooked.
4. Plate a bed of lettuce, top with fish fillet, topped with salsa and prawns, to serve.
