Defrost the slices of dough. Peel and chop onion and garlic. Halve the olives. Dice feta
Fry the minced meat in hot oil until crumbly. Fry onion and garlic briefly. Add tomatoes, bring to the boil. Season with oregano, salt and pepper and simmer for about 5 minutes. Let the minced meat mixture cool down a bit. Fold in olives and feta
Separate the egg. Place the slices of dough on top of each other. Roll out to a rectangle (20 x 40 cm) on a little flour. Cut into 8 squares (10 x 10 cm). Spread the chopped mass on top. Spread the edges of the dough with egg white and fold into a triangle. Press the edges firmly
Place the bags on a baking tray lined with baking paper. Brush with egg yolk. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 13-15 minutes