Mix together the mayonnaise, ketchup and lemon juice, then add the
prawns and combine.
Top 2 slices of the bread (you won't need butter or spread) with the prawns, add a pinch of paprika, season with a little black pepper then top with the remaining slices of bread. Cut into triangles and serve with the salad on the side.

#Tip:
You might like to add some thinly sliced tomato or rocket too.