01 - In a large bowl, beat softened butter and powdered sugar with electric mixer until mixture becomes pale and fluffy, approximately 3-4 minutes.
02 - Add lemon zest, chopped lavender, and salt to butter mixture. Mix thoroughly until ingredients are evenly distributed throughout.
03 - Gradually pour in flour while mixing on low speed. Continue mixing just until dough forms and no dry flour streaks remain visible. Do not overmix.
04 - Divide dough into two equal portions. Roll each portion into 2-inch diameter logs, wrap tightly in plastic wrap, and refrigerate for minimum 30 minutes until firm.
05 - Set oven temperature to 350°F. Line two baking sheets with parchment paper and set aside.
06 - Remove chilled dough logs from refrigerator. Using sharp knife, slice into 1/4-inch thick rounds and arrange on prepared baking sheets, leaving 1-inch space between cookies.
07 - Bake for 14-16 minutes until edges turn light golden brown. Allow cookies to rest on baking sheets for 5 minutes before transferring to wire rack to cool completely.
08 - In small bowl, whisk together sifted powdered sugar, lemon juice, and lemon zest until smooth and glossy. Adjust consistency with additional lemon juice if needed.
09 - Drizzle or spread lemon icing generously over cooled cookies. Garnish with additional lavender buds if desired. Let icing set completely before serving or storing.