Preheat oven to 350 degrees
Crust: (I used a whisk) mix whole wheat flour with brown sugar well, then cut butter into 1/2 inch pieces and mash into dough until it is in pea sized balls or smaller, and dough is crumbly
Bake crust for about 20 minutes, or until golden.
Then add lemon juice and the rest of your powered sugar (3/4 cup) and wait until sugar is completely dissolved before adding lemon zest.
Taste lemon filling and add powdered sugar to your liking (I usually add 2 tablespoons more)