Cook the spinach in about 2 tbsp water until wilted then remove from the heat to cool then squeeze out excess liquid and chop roughly.
Heat olive oil in a frying pan and fry onion till soft.
Add spinach, garlic and salt and pepper and cook for 5 minutes . Transfer to a bowl and leave to cool a little.
Mix in spring onions, dates, parsley, mint, pine nuts, feta and egg. Add extra seasoning if required.
Cut the sheet of pastry into 4 – 6 squares and brush 2 edges with a little milk.
Spoon some of the filling into each square then fold into a triangle pressing the edges together. Use a fork to crimp each edge to make a firm seal.
Repeat with remaining pastry and mixture. Place on a baking sheet, brush with milk and sprinkle with sesame seeds.
Bake at 200 C for 25 minutes until golden.