Mix self-raising flour, butter, Kaló yoghurt, sugar and salt until well combined.
Cover and rest for 30 minutes in a warm place.
Pre-heat oven to 180oC.
Grate feta cheese and mix with whisked egg, oregano and pepper.
With a rolling pin, roll out pastry to 2mm thickness.
Using a circular 10cm pastry cutter, cut out the pastry.
Spoon a heaped teaspoon of the feta mix onto one half of the pastry.
Using a brush or finger dipped in water, brush lightly over the edge of pastry.
Fold over the other half of pastry and seal with a fork.
Place on a baking tray, lined with baking paper.
With a pastry brush, glaze tiropita with egg/milk mix and sprinkle sesame seeds on top.
Bake in preheated oven at 180o C for approx 20 minutes or until golden brown.
