Be fair: aren't you a little more interested in Portugal now? I love rice pudding and custards, which are two of the most popular Portuguese desserts, but when I found out that the Portuguese have an orange cake, I had to try it. Orange cakes are one of my absolute favorites.
I was out of milk at the time so I had to scout around for a recipe that I could actually make, and then I ended up adjusting it anyway because I'm me.
Preheat the oven to 350F.
Separate 3 eggs and beat the whites until stiff. In a large bowl, beat 2.5C white sugar and 1/2C brown sugar with 1/4C olive oil and 1/4C yogurt. Stir in the egg yolks. Juice 1 orange and zest it. Add the juice and the zest to the mixture. Stir in 2.5C flour and 3tsp baking powder - batter will be really stiff, almost like dough. Fold in the egg whites until batter is smooth.
Pour into a greased 9" cake pan (springform is best - this is a sticky cake) and bake for 40mins. Remove from oven, cover with foil and bake for another 20mins.
Juice 1 orange, mix with 1/4C sugar and pour over cake as soon as you take it out of the oven. Let cool, and serve on its own or with whipped cream, or dulce de leche.