• Preheat the oven to 180°C/350°F. Place a rack in the center of the oven.
• Wash and pat dry the oranges. Cut into smallcubes (including their skin), discarding any pips.
• Place the orange cubes and the tablespoon of water in a saucepan over very low heat. Cover up and let it simmer for 30 minutes. Set aside and let it completely cool down.
• Place the cooked oranges in a food processor andgive it a quick blitz. Or even use an immersion blender. Set aside.
• Place the egg whites in a clean bowl of an electric mixer and beat on high speed until it turns foamy. Add only ½ cup of sugar and continue beating until soft peaks form.
• To a separate bowl, add the butter, the rest of sugar (1/2 cup), sugar vanilla and egg yolks. Beat for 1 minute. Add the ground almondsand whisk in the finely chopped oranges.
• Fold in the egg whites, scrape the edges of the bowl and stir well to incorporate the batter.
• Grease the sides and bottom of a 30cm/ 12 inches round cake tin, then place a parchment paper liner in the pan and grease the parchment paper lining the pan too.
• Spoon the batter into the prepared pan and bake for 50 -55 minutes or until you insert a skewer to the center of the cake and it comes out clean. Set aside to cool down.
• Invert the cake onto a flat dish. Set aside. The cake can be decorated with icing sugar and toasted almonds. Serve with a whipped cream, if desired.
• If you are willing to make the orange chips, keep on reading:

For the orange chips:

• Preheat the oven to 100°C/200°F. Place a rack in the center of the oven.
• Peel the orange. Using a sharp knife, slice the peels into the thinnest possible slices.
• Sprinkle an oven dish with ¼ cup sugar. Place the orange slices on the sugar and sprinkle the slices with the rest of the sugar.
• Bake the orange slices in the oven and check after 12- 15 minutes. Our goal is to caramelize the sugar and brown the orange peels without burning them. It may take 2 more minutes than the called time, depending on your oven. Remove the dish from the oven and let the orange chips completely cool down. Sprinkle on top of the cake ! Enjoy!