Preheat the oven to 180°C. Butter a metal pie dish and set aside

Heat the oil in a medium pan over a medium heat. Add the onions and cook for 4-5 minutes or until softened. Add the garlic and cook for a further 2 minutes.

Transfer to a large bowl to cool

Bring a large pot of water to the boil. In batches, add the spinach for 10-20 seconds before using tongs or a sieve to remove into a colander.

Refresh in cold water, drain again, and squeeze out any excess moisture. Transfer the spinach onto a chopping board and chop finely

Place the chopped spinach in the bowl alongside the onions and garlic. Add the eggs, ricotta, and crumble the fetta on top. Season with salt and pepper and mix well. Set aside

Lay a sheet of filo on a clean surface and brush with the melted butter. Top with another sheet of filo and brush with more butter. Repeat this 8 more times until you have a stack of 10 sheets.

Lay the filo stack in the prepared pie dish, and then fill with the spinach and cheese mixture

Brush the remaining filo sheets with butter. Place each on top of the filling to loosely cover, scrunching the pastry to fit into the tin.

Transfer into the oven to bake for 1 hour or until golden and cooked through. Allow the the pie to cool in the dish for 5 minutes before turning out

Slice and serve warm or at room temperature