Preheat the oven to 350°F.
Take a small mixing bowl and add the coconut flour and coconut sugar. Use a large spoon or a wire whisk to mix the sugar and flour together, breaking up any clumps.
Then add in the egg, lemon juice, maple syrup, and palm oil shortening. Mix the dough with a spoon until all of the ingredients are well incorporated and the dough becomes a little sticky.
Let the dough sit for about 5 minutes, allowing the coconut flour to absorb the liquid.
Line a baking sheet with parchment paper and use a cookie scoop (or a tablespoon) to drop rounds of dough on the sheet. Use your fingers to flatten the tops of each cookie.
Sprinkle the tops of each cookie with a little lemon zest, if desired.
Bake the cookies on the middle rack for 13-15 minutes, or until lightly browned. Let them cool for a few minutes before transferring them to a cooling rack.