Tropical prawn cocktail with mango and avocado

Ingredients

• 500 gram cooked medium tiger prawns, peeled, deveined, tails on
• 2 baby fennel bulbs, trimmed and thinly sliced
• 3 spring onions, thinly sliced
• 1 medium courgette, thinly sliced
• 1 avocado, seeded, thinly sliced
• 1 mango, peeled, sliced
• 1/3 cup picked dill
• 1 long green chilli, thinly sliced
• 1/3 cup olive oil
• 1/4 cup white balsamic vinegar