Line a large baking sheet with parchment paper and set aside.
In the bowl of a mixer mix together the melted coconut oil, sugar, egg, vanilla, and lemon juice for about 30 seconds until just combined.
Next add the almond flour, coconut flour, baking soda and salt. Mix on low until the dough forms, and then fold the lemon zest in using a wooden spoon. Refrigerate for 15-20 minutes.
Preheat oven to 350 degrees F and use a cookie scoop to portion out the dough on to the baking sheet. Flatten the dough lightly with the palm of your hand and bake for approximately 9 minutes. Cool on a wire wrack and dust with extra lemon zest if desired!
Notes
* make these cookies vegan by combining one tablespoon of the powdered egg replacer with two tablespoons of water and let it sit for a minute to allow it to thicken before adding in with the rest of the ingredients.