Take a round oven dish and grease it well with butter or oil spray. Ceramic dishes work best as they mean that you can keep the pie in the dish when serving it.
Preheat the oven to 180°C fan setting. Clear some space on your worktop and get your filo pastry ready.
Remove one sheet of filo pastry at a time and lay it out on a clean worktop with the long end in front of you. Keep the remaining filo sheets rolled up and cover them with a slightly damp kitchen cloth to prevent them drying out. Filo dries out very quickly and if this happens you can’t use them.
Place 5 tablespoons of oil in a small bowl next to you with a pastry brush. Brush your first filo sheet with a light layer of olive oil.
Take a tablespoon of your spinach and feta cheese mixture and spread it out along the long end of the filo pastry sheet. You want it to be about 2 cm thick so that there is enough to fill the coil, but not so much that it’s packed full and can’t bend. You need to be able to roll it up into a spiral later on. Leave 1-2 cm at each end with no filling.
Roll the filo pastry sheet tightly around the filling and continue rolling until you get to the end. You should now have a long round tube of filo pastry filled with spinach.
Coil the tube up to make a tight spiral and place it in the middle of your baking dish. This is your first coil which is the start of your spiral. Your other ‘coils’ will move out from that first one.
Repeat the process with the remaining sheets of filo pastry and spinach filling, working out from your first coil until the oven dish is full.
Brush the top of your spinach pie with olive oil and sprinkle with sesame seeds (optional).
Cook the spanakopita spiral on the middle shelf of the oven for 25 minutes or until the top is golden. Remove and enjoy while warm!