Another from the mother in law. I don't leave tails intact, personal preference. Preparation time includes peeling prawns. Spring onions also known as scallions or green onions. UPDATE - thank you to Karen Elizabeth would never have thought to use this as way to cook the prawns to ADD to other dishes such as she did with a vegetable stir fry - great idea, thank you. A PLEASE NOTE - I now have a 900W microwave and I find 3 1/2 to 4 minutes does it, When this recipe was first presented wattages in ovens where very low so the higher wattages today will determine the cooking times.