- Step 1
Combine the mayonnaise, smoked paprika, lemon juice and 1/2 teaspoon smoked or regular salt in a small bowl. Cover and chill until serving.
- Step 2
Season prawns with the remaining salt and some pepper, then set aside. Toss avocado with olive oil and season with sea salt and black pepper. Set aside.
- Step 3
Divide lettuce among 8 serving glasses. Top with avocado, cucumber and most of the spring onion. Arrange prawns on top and finish with a generous dollop of the smoky mayonnaise.
- Step 4
Sprinkle prawns with remaining onion and some smoked paprika and serve.
Smoked paprika (pimenton) and smoked sea salt are available from delis and gourmet food shops.