Tart Pastry:

2 cups All purpose flour
1/4 cup Sugar
1/4 cup Butter
1/4 cup Shortening
1 Whole egg, beaten
3 tablespoons Ice water

1. Preheat oven to 375 degrees.
2. Sift together flour and sugar and place in a food processor fitted with the steel blade.
3. Add butter and blend for 20 seconds.
4. Add shortening and blend for 20 seconds.
5. Add beaten egg and blend  for 30 seconds.
6. With the machine running, add ice water and a tablespoon at a time until the dough forms a ball.
7. Remove dough from food processor, cover with plastic wrap and allow to rest in refrigerator for 30 minutes.
8. Roll out chilled dough to fit your tart pan. 
9. Add filling and bake.

Cheese Filling:

1 pound Cottage cheese
8 ounces Sour cream
6 Egg yolks
5 tablespoons sugar
1 tablespoon Corn starch
2 teaspoons Vanilla
Zest of 1 lemon and juice of 1/2 lemon
3 Egg whites, stiffly beaten with a pinch of salt

1. Combine all ingredients except egg whites, and beat until very smooth.
2. Fold in beaten egg whites and fill pastry shell.
3. Bake for 1 hour at 375 degrees.