1. Set aside 4 of the prawns for garnish. Separate out 4 attractive,intact leaves of the lettuce and trim any of the hard stalk part to create a cup shape. Finely shred the remaining lettuce and cut the remaining prawns into 1cm pieces.
2. Combine the chopped prawn meat,chopped lettuce,mayonnaise,tomato sauce,Tabasco,paprika,herbs (reserving a little as a garnish) and lemon juice in a bowl and stir to combine. Gently fold through the diced avocado. Fill the lettuce cups with the mixture and garnish with a wedge of avocado,a whole prawn and a bit of extra herbs. Serve with the lemon wedges.
Tip:Be sure to take the digestive tract out of your cooked prawns. To do so,take off the head and shell,peel back a strip along the"spine"of the prawn and remove the digestive tract.