Method

1. Defrost prawns in cold water. Place into boiling salted water for 5 - 7 minutes until they have turned pink and are white inside. Once cooked, shell the prawns leaving the tail intact.
2. Divide the lettuce between 4 serving bowls. Divide the prawns, crab, and avocados between the bowls. Splash with a little lemon juice.
3. To make the dressing: combine all the ingredients. Serve the dressing separate in small bowls.