Shell the prawns, leaving the last segment of the shell and the tail intact.
Rinse, drain, and dry with paper towel.
Gently pan-fry the spring onions in olive oil until translucent, then add the garlic and sauté for about 1 minute.
Add tomatoes, wine, parsley, oregano, sugar, salt, and pepper, and simmer gently for 20-25 minutes or until it becomes very thick.
Spoon about half of this sauce into a baker’s pan, and arrange the prawns over top of the sauce.
Spoon the remaining thick sauce over top of the prawns and top with the feta cheese.
Heat oven to 425° F and bake the prawns for about 20 minutes or until they appear pink and the feta cheese appears slightly melted.
Sprinkle with the chopped parsley and serve.