King prawn cocktails with chilli and mango recipe

Ingredients

• 1 mango ripe, diced into 5mm cubes
• 1/2 cucumber, deseeded and finely chopped
• 1/2 small red onion, finely chopped
• 125 g (5 oz) mayonnaise
• 1 tbsp cajun seasoning
• 1 tbsp fresh lemon juice
• 1 tbsp chilli powder mild
• 8 iceberg lettuce leaves
• 12 (about 250 grams or 9 ounces) cooked large king prawns, peeled
• Lemon wedges, to serve