Step 1

Using a blender, puree 1 avocado with the buttermilk and half the lemon juice. Cut remaining avocado into 1cm pieces and in a separate bowl, toss with the prawns and remaining lemon juice. Season with sea salt and freshly ground black pepper.

Step 2

Combine mayonnaise, tomato sauce and Tabasco in a bowl and season.

Step 3

Spread the ciabatta slices with a little of the avocado puree. Top each with a lettuce leaf and prawn mixture. Drizzle with cocktail sauce, dust with cayenne and top with dill sprigs, to serve.