Defrost the prawns if necessary. Wash and peel the asparagus and cut off the woody ends. Cook the asparagus in boiling salted water with 1 tsp. sugar for about 12 minutes.
Peel and finely dice the onion and garlic. Clean, wash and chop the peppers. Heat 2 tablespoons of oil in a saucepan. Fry onion, garlic and paprika briefly. Add tomatoes and juice and chop coarsely with a spatula.
Bring to the boil and season with salt, pepper and sugar. Cover the sauce and simmer at low heat for about 20 minutes.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Drain the asparagus, allow to drain and place in a large casserole dish. Wash parsley, shake dry, remove leaves and chop finely.
Stir the parsley into the tomato sauce. Season the sauce again and pour over the asparagus. Crumble the feta and sprinkle over the asparagus. Bake in a hot oven for 12-15 minutes.
In the meantime, wash the prawns and dab them dry. Heat 2 tablespoons of oil in a large frying pan. Fry the prawns in it all around for about 3 minutes. Season with salt and pepper. Remove the asparagus from the oven and spread the prawns on top.
Flatbread.