Method

• 1.
  For the pickled cucumber, sprinkle cucumber with 1/2 tsp salt and set aside for 20 minutes. Meanwhile, combine vinegar and sugar in a small saucepan, and bring to the boil to dissolve the sugar. Set aside to cool.
• 2.
  Rinse cucumber and dry with paper towel. Pour cooled pickling liquid over.
• 3.
  For the spicy rose mayonnaise, combine all ingredients in a small bowl, season with salt and pepper. Mix well.
• 4.
  Spread bread with butter. Place lettuce leaves on 4 slices and top with prawns. Squeeze juice from 1 lemon quarter over the top and season with salt and pepper. Lay some pickled cucumber on top of the prawns. Spread remaining slices of bread with plenty of spicy rose mayonnaise, then place mayo side down on top of the cucumber layer. Press down gently. Cut sandwiches in half and serve immediately.
• 5.
  Variations: I sometimes serve these as open sandwiches, laying out the lettuce, prawns and cucumber on a plate. Cut small squares of bread and butter them generously, then top with lettuce, a single prawn, a ribbon of cucumber and a dollop of spicy rose mayo. These go exceedingly well with a glass of riesling. Crab or lobster would make a great version of this sandwich. Or, for a fried fish version, crumbed is hard to beat. Serve in a crusty roll or milk bun.