In a robot, mix flour, yeast and milk together. Let the dough rest
10 minutes.
Then add sugar and salt and mix again for 10 minutes.
Then add butter and mix for a few minutes.
Shape a ball of dough and let it rest for about an hour under a cloth.
Now roll out the dough with a rolling pin.
You can grease a tart dish with fat and place the dough.
Brush the edges of the tart with an egg yolk using a brush.
The Bourgeoise or leavened dough is ready to be used.
Several variants can be a pleasure, with apples, rice and even spices!