In a medium-sized mixing bowl whisk together flour, baking soda, and kosher salt and set aside.
In the bowl of an electric mixer add 1-1/4 cup of the granulated sugar, butter, lemon zest, and vanilla bean paste.
Mix until creamed and the mixture looks light and fluffy, about 5 minutes. Make sure to scrape down the sides of the bowl a few times while mixing.
Add in the egg and lemon juice, mix just until combined.
With the mixer on low, slowly add in the flour mixture and mix just until combined.
Cover the bowl, and let the dough rest for an hour in the refrigerator.
Before baking, preheat the oven to 350 degrees F and prepare baking sheets with non-stick spray or line with parchment paper.
Scoop out 2 tablespoon sized balls of dough, roll in remaining 1/2 cup sugar and place on your prepared baking sheets. Leave 2 inches between cookies.
Place into the oven for 6 minutes, remove, flatten cookies to 1/4 inch thick with the bottom of a glass and add back to the oven to bake for another 6 minutes.
Let cool and enjoy.