Clean the spinach, wash thoroughly and drain. Peel, halve and slice the onion and garlic. Wash and clean spring onions, cut the white into cubes, the green into fine rings.
Peel the shrimps, except for the tail fin, and remove the intestines. Wash the shrimps and dab them dry. Rinse oregano, put some leaves aside for garnishing, chop remaining leaves finely. Put spinach in boiling salted water, bring to the boil, rinse in cold water and let cool.
For the tomato sauce, steam 1 teaspoon of oil, half the garlic, diced spring onion and 2 tablespoons of water for 5 minutes. Add the tomato puree and paste and steam for another 3 minutes. For the spinach vegetables, sauté 1 teaspoon of oil, onion and remaining garlic in a saucepan for 5 minutes.
Add dripping wet spinach and steam for 3 minutes. Heat 1 teaspoon of oil in a coated pan, fry the prawns on both sides for 2 minutes each, season with salt and cayenne pepper. Add chopped oregano and spring onion rings to the tomato sauce, bring to the boil and season with salt, pepper, paprika and sugar.
Season spinach with salt, pepper and nutmeg. Arrange prawns on the spinach, add tomato sauce and garnish with remaining oregano.