For the bifteki, soak the rolls in cold water. Squeeze the buns well and add to the minced meat with the onions.
Add lemon juice, eggs, parsley and mint, season with salt and pepper, knead into a smooth mass.
Separate small portions with a spoon, flatten with floured hands, add feta cheese on top and coat with mince.
Dredge the meatballs in flour. Heat clarified butter, deep-fry meatballs in batches and drain on paper towels.