Drain the potatoes on a sieve. Heat 3 tablespoons of oil in a frying pan and fry the potatoes for 12-15 minutes over medium heat until golden brown. Season with salt and pepper.
Clean the mushrooms, wash if necessary and cut in half. Clean, wash and cut spring onions into pieces. 5 minutes before the end of the cooking time add the mushrooms to the potatoes and fry them. Heat the rest of the oil in another pan and fry the prawns all around for 3-4 minutes.
Season with salt and pepper. Clean, wash and quarter the tomatoes. Shortly before the end of the cooking time, add the prawns and tomatoes to the potato pan. Wash the chives, dab dry and cut into small rolls.
Sprinkle over the potato pan and serve garnished with parsley as desired.