Put butter in a pan and add in prawn tails then cook and stir for a couple of minutes, add in lemon juice, lemon zest, season with salt and pepper.
In this time add pasta to salty boiling water and cook until done, then drain but save some starchy water!
Add arugula to the sauce and cook for a minute so that it becomes wilted.Add in cooking cream and cook for a minute or two. Don’t worry if it looks watery, the pasta will thicken it up. Then add in cooked pasta and stir. Also pour in some pasta water to make it creamy consistency to your liking and serve immediately. ⠀Drizzle a little lemon juice on top and enjoy.