In the blender:
The eggs
The sugar
The oil
Juice of 2 oranges
1 orange, peeled and seeded (cut into 4 parts to make it easier to remove the seeds)
Beat for 3 minutes
Pour the mixture into a bowl and add the sifted flour
Mix with a fuet
Add the baking powder, and mix gently.
Pour in greased and floured form
I used one of 25 cm in diameter by 5 cm in height.
Bake in a preheated oven at 180 degrees for 45 minutes and do the toothpick test.