Sift flour into a bowl and mix in water and oil to form a soft dough.
Knead the dough for 10-15 minutes until smooth, then chill in the fridge for one hour.
Cook washed spinach in a lidded pan over medium heat with seasoning.
Drain spinach thoroughly, removing all moisture with paper towels, then mix with nutmeg and lemon zest.
Stir beaten egg and crumbled feta into the cooled spinach mixture and adjust seasoning.
Preheat oven to 175°C and prepare parchment paper, melted butter, and the pasta machine.
Divide dough into five balls and flatten each into a rectangle with a rolling pin.
Pass dough through the pasta machine to setting seven and stretch by hand until very thin.
Layer the pastry sheets on parchment paper, brushing each layer with melted butter.
Spread filling along the edge, roll into a sausage shape, then coil into a spiral.
Brush with egg yolk and butter, sprinkle with sesame seeds and salt, then bake for 35 minutes until golden.