Preheat oven to 375 degrees. Roll out the pastry dough and place it on a 10 inch tart pan. Chill for 10 minutes. Bake the shell until half done, approximately 10 minutes.

Meanwhile, make the filling by combining the cream, sugar, eggs, lemons and blueberries in a large bowl. Stir well. Remove tart shell from the oven, add the filling and cook for 45 minutes at 375 degrees until firm. Dust with powdered sugar before serving. Serves 6-8.