Preheat oven to 350° F.
In a medium bowl mix graham cracker crumbs with melted canna-butter together.
Press crumbly mixture in an ungreased pan 9x13inch pan.
Bake for 15 to 20 minutes in the preheated oven, or until firm and golden. In another bowl, whisk together the 1 1/2 cup sugar, and 1/4 cup of flour. Whisk in the eggs and lemon juice. Pour over crust.
Bake for additional 20 minutes in preheated oven. The bars will firm as they cool.
Once lemon bars have cooled sprinkle the confectioners sugar on top of the bars and sprinkle zest on top. Cut and serve.