Preheat oven to 400Fº. In a large saucepan over medium, heat oil. Add onion and sauté for 3 minutes. Add garlic and red pepper flakes; sauté for 1 minute. Add Roma tomato, tomato paste and black olives; cook, stirring for 1 minute. Add wine and simmer until reduced by half.
Add pasta tomato sauce, basil, ouzo, black pepper and sea salt; reduce heat to low and simmer for 10 minutes or until thick. About 2 minutes before the end of cooking, stir in sugar.
In a 8 x 8-inch or 2-quart baking dish, spread tomato mixture. Place prawn and using a spatula, lightly push them down half way of the prawn. Top with feta cheese and transfer to the preheated oven; bake for 10-12 minutes or until cooked through. Sprinkle parsley and serve with fresh crusty bread.