01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the gluten-free flour blend, baking soda, and fine sea salt. Set aside.
03 - In a large mixing bowl, cream the softened butter and 3/4 cup granulated sugar with an electric mixer until pale and fluffy, about 2 minutes.
04 - Beat in the egg, pure vanilla extract, lemon zest, and freshly squeezed lemon juice until mixture is fully combined.
05 - Add the dry ingredients gradually to the wet mixture, mixing on low speed until just combined.
06 - Using a spatula, gently fold in the unsweetened shredded coconut until evenly distributed.
07 - Scoop tablespoon-sized portions of dough, roll each into a ball, then coat in the reserved granulated sugar.
08 - Place dough balls 2 inches apart on the prepared baking sheets. Gently press down to slightly flatten each.
09 - Bake for 10 to 12 minutes or until edges are set and just turning golden.
10 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.