The origins of the Basque cake Iparralde are located in the French Basque country. Was done in the villages of the region on holiday, was the "bread on Sundays." Over time, the bakers have improved the recipe and the recipe has evolved. Now made of thin pastry stuffed pastry cream, but there are also variants with cherry jam.
The recipe I'm using is the pastry cream, and as you will see, is not very "light" 
Basque Ingredients for the cake:
For the pastry:
500 gr. flour
1 envelope of yeast
300 gr. butter
300 gr. sugar
1 egg yolk
3 eggs
For the pastry cream:
1 / 2 liter of milk
1 whole egg
3 egg yolks
75 gr. sugar
30 gr. refined corn flour
1 cinnamon stick and lemon zest / orange
Basque Cake Recipe:
First start with the pastry cream. He begins to heat nearly all the milk (reserve about 150 milk) and add the flavoring. You can use a cinnamon stick or lemon or orange peel, is more a matter of taste. I used lemon peel.

Basque Cake Recipe
In a bowl, place flour, refined corn, sugar and milk that had been reserved.

Basque Cake Recipe
Stir well and add the 3 egg yolks and whole egg and mix again.

Basque Cake Recipe
He adds a bit of hot milk (not all!), Stir and pour the mixture with the remaining hot milk.

Basque Cake Recipe

Basque Cake Recipe
Keep the fire and stirring constantly until thickened. Book.

Basque Cake Recipe
To make the pastry, put in a large bowl the eggs, yolks and sugar. It has to beat all very well, so better to use an electric blender.

Basque Cake Recipe
It has to add the butter cream point, whisking. For Where to butter is squishy can take 15 minutes before using, or a little warm in the microwave (but watch that will not melt!).

Basque Cake Recipe
In another bowl sift the flour must and yeast. Once mixed, it is added to the mass gradually and knead to make it a smooth paste.

Basque Cake Recipe

Basque Cake Recipe
Now we just place the dough on a piece of plastic and place in refrigerator to harden.

Basque Cake Recipe
When the dough is ready, spread a little butter in pan and cover with pastry. There is only filled with pastry cream and top with the remaining dough. The extra mass would have to take to 2-3 pies can be frozen without problems.
If you do not think then decorate the cake, beat one egg and spread with the surface to give it a more golden. Another option is to use icing sugar, to make any figure on the cake with some mass (a lauburu, for example) or mix several techniques.
I have chosen to cover it with icing sugar and dedicate a "marker" special pastries.

Basque Cake Recipe

Basque Cake Recipe
This recipe is dedicated to all readers of the site and in particular:
- Natalia and Abel, because without the mixer that I got would not have been possible
- Evatxu, for giving me the recipe and your company. Maite Zaitut
- Vanessa Pulido, because you love pastries 