Mix together the egg yolk, mustard, lemon juice, paprika and cayenne. Whisk in the vegetable oil in a slow stream until you have a smooth mayonnaise
Mix in the ketchup then season with salt and pepper
Mix the prawns with sauce to taste
Drizzle the lettuce with oil and season with salt
Char the lettuce, cut side down, then remove from the pan
Finely shred the lettuce then mix with the vinegar and season to taste
To serve, place a slice of white sourdough on a board and top with the prawn mix and the lettuce. Top with the other slice of sourdough then serve sprinkled with chives
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