Preheat oven to 350 degrees F.
Line baking sheet with parchment paper.
In a small bowl, combine sugar, lemon zest, and lavender and rub all together between your fingers for about 1 minute.
Combine sugar/lemon zest/lavender with butter in a large bowl with electric mixer.
Beat on high for 1 minute.
Add lemon juice, egg, and vanilla extract and beat until well combined.
Add baking soda and salt, and beat until combined.
Add flour and beat until combined.
Roll dough into approximately 1 tablespoon balls.
Roll balls in sugar and place on baking sheet, about 2" apart.
Bake in preheated oven for 10-12 minutes, until edges are just set. They will seem a little underdone that is okay - they will set up and be chewy in the middle!
Let cool for 5 minutes on baking sheet then transfer to a cooling rack to cool completely.
Repeat with remaining dough.
Eat and enjoy!