1Preheat oven to 375° F
2In a medium bowl combine the zest and 1/2 cup sugar, blend together until glistening. Add the softened cannabutter butter and 2 cups flour, mix with a wooden spoon to form a stiff dough. Press into the bottom of an greased 9x13 inch pan.
3Bake for about 20 minutes in the preheated oven, or until firm and golden.
4Meanwhile juice the lemon and lime.
5In a medium bowl, whisk together the remaining 1 1/2 cups sugar and 1/4 cup flour. Whisk in the eggs and lemon juice. Pour over the baked crust.
6Bake for about 20 minutes in the still heated oven. The bars will firm up as they cool.