Classic Quiche Lorraine

For the dough, combine flour, butter, egg yolk, and 3 tablespoons of water in a bowl and work into a smooth dough with your hands. Form the dough into a ball, wrap tightly in cling film, and let it rest in the refrigerator for 2 hours.

Cut onions and bacon into fine strips.

Heat oil in a pan over medium heat and fry the bacon until golden brown. Remove the bacon with a spoon, drain on kitchen paper, and let cool.