Place a large pot of water on to boil. Season the water with salt. Follow packet instructions to cook linguini.
In a large deep pan add the oil and butter, garlic and chilli and cook on medium heat. Add the capers, tomatoes and lemon. Stir and cook for 2 minutes. Add the prawn meat and cook for further minute. Drain the pasta and add to the prawns with 1-2 tablespoons of the cooking water. Finally add the rocket, parsley and parmesan.
Toss in the pan and serve immediately with an extra drizzle of good extra virgin olive oil.