Preheat oven to 180oC.

Lightly salt grated zucchini and leave in a colander to drain their juices for 15 minutes. In the meantime, brush a 25cm x 25cm baking tray with some of the extra virgin olive oil.

Heat some of the olive oil in a pan but keep some aside for brushing the filo pastry sheets. Cook the grated onion and the finely chopped spring onions until transparent. Add the drained zucchini and grated carrots and cook for 3 minutes, until this mix looks slightly dry.

Leave aside this mix and let it cool for a while. Then add in the cooled mix, the whisked eggs, crumbled feta cheese, finely chopped parsley and dill, salt and pepper. Mix well until a homogeneous filling results.

Place the first three filo pastry sheets, each brushed with olive oil, concurrently on the baking tray. Then add the filling. Top the filling with the rest of filo pastries as earlier. Any excess of the filo pastry sheets should be pulled bownwards on the sides of the baking tray.