Pre-heat fan-forced oven to 175ºC. Place 2 oranges (unpeeled) in a saucepan and cover with cold water. Bring to the boil then simmer covered for 45 minutes. (Make sure oranges remain covered with water). Drain and cool.

Meanwhile, thinly slice remaining orange. Cover the bottom of a lined large round cake tin with the orange slices. Set aside.

Cut cooled boiled oranges into quarters (discard any seeds). Place boiled oranges, eggs, dates, baking powder and vanilla powder into a high powered blender and puree until smooth.

In a medium bowl mix together orange puree with almond meal. Pour batter on top of orange slices in your cake tin and bake for 1 hour 40 minutes.

Allow to slightly cool for 15 minutes then turn out so the orange slices at the bottom become the top of your cake.

 
Tip: If you have a sweet tooth add a few extra dates or serve with a drizzle of maple syrup.