01 - In a large bowl, beat the softened butter and powdered sugar together until the mixture becomes pale, light, and fluffy.
02 - Add the lemon zest, chopped lavender, and salt to the butter mixture. Mix thoroughly until evenly distributed throughout.
03 - Gradually incorporate the flour, mixing just until the dough forms a cohesive ball and all dry streaks disappear. Avoid overmixing to maintain tender texture.
04 - Divide the dough into two equal portions. Roll each portion into a log approximately 2 inches in diameter. Wrap tightly in plastic wrap and refrigerate for at least 30 minutes until firm.
05 - Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside.
06 - Remove the chilled dough logs from the refrigerator. Slice into rounds about 1/4-inch thick and arrange on the prepared baking sheets, leaving slight space between each cookie.
07 - Bake for 14 to 16 minutes until the edges turn lightly golden. Remove from oven and let the cookies rest on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.
08 - Whisk together the sifted powdered sugar, lemon juice, and lemon zest until smooth and glossy. Adjust consistency with additional lemon juice if needed.
09 - Drizzle or spread the lemon icing evenly over the cooled cookies. Garnish with dried lavender buds if desired. Allow the icing to set completely before serving.