Heat the oven. Preheat oven to 375°F.
Make the dough. Add flour and salt to the bowl of a food processor fitted with a standard blade; pulse 2-3 times. Add butter and pulse several times until a pea-sized mixture forms. With the motor running, pour in water, continue to process until a ball forms.
Roll the crust. Lightly flour a work surface. Roll dough into a circle to fit your pie pan. Place dough in the pie pan; flute the edges if your pie pan does not have a natural curve to it. Refrigerate until ready to assemble quiche.
Saute the filling. Heat a medium saute pan to just under medium heat. Add pancetta and cook 7-8 minutes, until crisp. Remove from pan and drain on a plate covered with a paper towel. Add leeks to the pan, sauté 1 minute. Remove leeks from pan and add to cooling pancetta.
Make the egg mixture. Place eggs in a large bowl, whisk until all yolks are broken. Add half & half, salt and pepper; whisk until blended. Add cheese, leeks, pancetta, cardamom and parsley. Mix well.
Prepare and bake. Pour egg mixture into the prepared pie crust. Cook for 40 minutes or until a knife comes out clean. Cool slightly before serving.