Preheat the oven to 350 degrees F (176 degrees C).
Beat together the butter and sugar until fluffy.
5 tablespoons (70 grams) butter, 1/2 cup + 2 tablespoons (125 grams) unrefined sugar
Add the egg, lemon zest and lemon extract and mix until well combined.
1 large egg, 2 teaspoons lemon zest, 1 1/2 teaspoons lemon extract
Add the remaining ingredients (white whole wheat, flour through baking soda) and mix for a minute or until well combined.
3/4 cup (93 grams) white whole wheat flour, 3/4 cup (93 grams) whole wheat pastry flour, 1/4 tsp salt, 1/4 tsp baking soda
Press into the bottom and all the way up the sides of a 14"x5" tart pan and bake for 15 minutes.
Let the tart cool completely before filling.