Wash and drain the prawns. Puree the basil leaves with 4 tablespoons of olive oil in a blender or with a magic wand and season with salt and pepper.
Cut the shrimp in a fan shape (butterfly), fry in 4 tablespoons of oil and with the garlic in a non-stick pan over medium heat for about 6 minutes. Halve or quarter the tomatoes depending on their size, then add to the prawns and cook for 1 minute. Serve the oil separately or drizzle over the portions.
Vanilla onions go well with it (also found in my recipes).