Step 1

Combine prawns with cheeses, parsley and isot pepper, then fold through yolks.

Step 2

Cut fillo into 9cm x 45cm strips and keep covered with a damp tea towel. Place 2 strips on top of each other, place 2 tbsp of filling at one end, then fold one corner of pastry overfilling to form a triangle. Repeat folding from side to side in a triangle shape until there is one fold left. Brush end with water, make the last fold and press to seal and form a triangular parcel. Trim excess pastry if needed. Repeat with remaining fillo and filling and refrigerate uncovered to dry (1 hour).

Step 3

Heat oil in a large deep saucepan to 180°C. Deep-fry börek, in batches, turning occasionally, until golden and cooked through (3-4 minutes; be careful, hot oil may spit). Drain on paper towels, sprinkle with nigella seeds and serve.