Preheat the oven to 180c/160c fan/350f/gas mark 4 and line a large baking tray.
Wilt your spinach. Give it a good rinse in a colander, then sit the colander in the sink and pour boiling water over the spinach to wilt it. Refresh with cold water.
Squeeze as much of the water out of the spinach as you can, then chop it and set aside.
Crumble the feta into a large mixing bowl, then add the grated halloumi.
Add the spring onions and chopped wilted spinach.
Now add the nutritional yeast, nutmeg, chilli, salt and pepper and mayo and mix well.
Take your filo pastry out of the fridge, remove from the package and carefully unroll the sheets. Cut in half lengthways, so you have two long piles of pastry.
Take two sheets from the pile and wrap the rest in a clean, damp teatowel, to stop it from drying out.
Lay down one sheet, spray a light mist of oil over it (or brush with melted vegan butter), then place the second sheet on top. Spray down the long side with oil.
Add a sausage shape of the cheese mixture to the bottom of your rectangle of pastry, leaving a border around it. About 2 generous tablespoons of mixture.
Fold the bottom sides of the pastry over the edge of the filling and then roll the bottom of the pastry over the filling and keep rolling up the pastry until you have a cigar shape. Place on the lined sheet.
Do the same for the rest of the filling and pastry sheets.
When they are all made and on the tray, spray with oil and sprinkle with seeds, then bake in the pre-heated oven for 20 minutes until golden and crisp.
See notes for leftover pastry ideas.
Leave to cool, then serve with salad.
Enjoy!