Method

Preheat the oven to 180ºC. Heat a saucepan on a medium setting, add a glug of olive oil and sauté the onion. After about five minutes, add the garlic to the pan and stir for a moment or two. Stir in the spinach and cook until it darkens and becomes limp. Remove the pan from heat and leave to cool.
Meanwhile, mix the eggs with the feta and ricotta in a separate bowl. Once the spinach and onion mixture has cooled, squeeze it with your hands, and then pat it dry with kitchen roll until little or no moisture remains. Add this to the bowl with the eggs and cheese, mix together thoroughly. Season well.
Brush four sheets of filo with olive oil, and layer them on a baking tray to make the base of your pie. (Don’t worry if it overhangs, you’ll tuck it in later.) Place the spinach and cheese mixture onto the filo and spread around evenly. Brush the remaining four sheets of filo with olive oil and use them to top your pie, pressing the edges of the top and bottom layers together to seal in the filling. Brush with olive oil and cook for 35-40 minutes, until golden brown. Serve just warm (not hot!), either on its own as a snack, or with a Greek salad.