Combine all the ingredients in a large bowl, adding a few shakes of Worcestershire sauce and Tabasco to taste.
Tip the prawns into the dressing and leave to marinate for 30 minutes in the refrigerator.
Arrange the shredded lettuce in the bottom of any retro vessel, then top with avocado.
Spoon the prawns and dressing on top and decorate with a lime wedge.
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