Prepare the Oranges: Place whole oranges in a medium saucepan, cover with water, bring to a boil, then simmer for about 1 hour until soft.

Make Orange Puree: Once cooled, chop the oranges and blend in a food processor until smooth.

Preheat Oven: Preheat oven to 350°F (175°C) and prepare a 9-inch springform pan.

Mix Batter: Beat eggs and sugar until pale, fold in orange puree, and then add almond flour, baking powder, and salt.

Bake: Pour batter into the pan and bake for 50-60 minutes until golden brown and a toothpick comes out clean.

Cool: Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Serve: Dust with powdered sugar and garnish with orange slices or edible flowers before serving.