- 80 ml (2½ fl oz/⅓ cup) olive oil
- 1 tab
- To make the dressing combine the oil, vinegar, mustard and orange zest. Season with salt and freshly ground black pepper.
- Preheat a barbecue grill or chargrill pan, brush the prawns with a little of the dressing and cook for 5 minutes. Transfer to a large bowl with the onion, avocado and mango.
- Tear the lettuce into small pieces if ne