1.Preheat oven to moderate, 180°C. Lightly grease a 24cm round, 4cm deep, ovenproof pie plate.
2.In a large bowl, whisk all ingredients together until smooth. Pour into dish.
3.Bake for 40-45 minutes, until set and lightly golden. Cool slightly and dust with icing sugar. Serve warm or cold, with whipped cream or ice-cream.
If preferred, you can replace lemon with orange or lime.Note