Sublime orange and almond cake recipe

I am happy, because I have two oranges sitting on my kitchen bench and I can almost already taste this:

ORANGE AND ALMOND CAKE

2 oranges
6 eggs
250g caster sugar
250g almond meal
1tsp baking powder
Extra caster sugar for dusting before baking
Icing sugar for dusting after baking
Margarine or oil spray (for greasing the pan)

Wash oranges and place unpeeled, in a pot of boiling water for 2 hours. Drain the water and allow the oranges to cool. This can be done ahead of time.
Preheat oven to 190°C.
Break 6 eggs into a mixing bowl or blender. Add caster sugar and beat or blend together.
Place the two oranges into the egg mix. Break up the oranges and then blend together to a smooth consistency. Add the almond meal and baking powder and blend.
Grease a 20 cm spring form baking pan with margarine (or vegetable oil spray) and dust with caster sugar.
Pour batter into the pan and sprinkle caster sugar on top and bake for 1 hour to an hour and a half or until the top is golden brown.
Dust with icing sugar to serve.

Recipe from http://www.sbs.com.au/food/foodsafarirecipe/index/id/677/Orange_and_almond_cake