Preheat oven to 180C. Grease a 22cm springform pan. Line bottom of the pan with baking paper.
Combine dry ingredients in a bowl and mix together well.
In a separate bowl, lightly beat the eggs. Add cooled butter, milk and citrus juices. Combine well.
Make a well in the dry ingredients and pour in the wet mixture. Mix together well - the batter should be smooth and quite runny.
Pour into prepared pan and bake for 1 hour, or until golden brown. It is ready when a skewer inserted into the middle comes out clean.
Remove from oven and place on cooling rack. Gently run a knife around the edge of the cake to ensure it isn't stuck.
After 5 minutes, release the spring and remove the outer ring. Allow to cool completely before removing from base.
Serve dusted with icing sugar and a big (optional) dollop of cream.