My dear friend Sara organized a wonderful cookies swap to celebrate Christmas!
She invited over some other girls, Italians, Americans, a French girl and we swapped all different kind of cookies.

I brought 3 different kind of cookies: simple Italian cookies in the shape of hearts, cranberries rockies and this sablée Breton.
Sablée Breton are basically made of butter, flour and sugar. But the butter is a special kind of butter: demi-sel, that means salted butter.
Bretagne is very famous for its salted butter, and for its sablée too.
the recipe I used is by the best, the unique, the one and only patissier in the entire world: Pierre Hermé!

For 30 4×4 centimeter square sablée Breton

133 g demi-sel butter, room temperature
60 g sugar
50 g butter, room temperature
1 g fleur de sel (or crashed Maldon salt)
7 g hard boiled egg yolk, room temperature
167 g flour
34 g potato starch

In a mixer bowl, with a paddle attachment, make a paste with demi-sel butter and sugar.
Add the rest of the ingredients in the order stated above and form a smooth bowl.
Let it rest for at least 1 hour in the fridge.

In the mean while, preheat the oven at 170° C.
Lay out the dough, 5 millimeters thin.
Bake for 15 minutes, then cut out 4×4 centimeters squares and bake again for 5 minutes, until golden.

To give a bit of color I added some pistachio nuts before the second bake.

Let them cool completely before serving.