Prepare the cake

1. Wash the oranges and place them whole, with the peel on, in hot water over medium heat. Boil for about 1 hour, until tender.
2. Cut them in halves or quarters and blend them (whole, with the peel) until creamy.
3. Preheat the oven to 160°C.
4. Grease a round cake tin or springform tin and line the base with baking paper.
5. Beat the softened butter and sugar until creamy.
6. Add the eggs one at a time, beating to a smooth, even mixture.
7. Add the ground almonds, baking powder, and blended oranges.
8. Pour the batter into the tin and bake.
9. Bake for 1 hour. Check with a knife in the centre: it should come out clean and dry.

Make the orange caramel:

• In a saucepan, combine the orange juice, water, and sugar.
• Keep at a boil for about 15 minutes over medium heat, or until syrupy.

Dust the cake with icing sugar and serve with a little syrup.