Place whole oranges in a large pot, cover with water, bring to a boil, and cook for 30 minutes.

Remove the oranges and allow them to cool, then slice in half, remove seeds, and chop into pieces.

Preheat the oven to 160°C (320°F) and prepare a 23cm cake pan with greasing and parchment.

In a food processor, combine chopped oranges, almond meal, eggs, baking powder, and sugar; blend until smooth.

Pour the batter into the cake pan and smooth the top. Bake for approximately 60 minutes or until a toothpick comes out clean.

Let the cake cool in the pan for 15 minutes before unmolding onto a cooling rack to cool completely.