Preheat oven to 350 degrees F (175 degrees C). Grease baking sheets.
In a medium bowl, cream together the butter and confectioners' sugar until light and fluffy. Beat in the lemon zest and vanilla extract.
In a separate bowl, sift together the flour, salt, baking powder, and baking soda. Gradually beat into the butter mixture. Stir in the lemon juice.
Shape dough into 1 inch balls, and roll in granulated sugar. Place cookies 2 inches apart onto the prepared baking sheets.
Bake for 10 to 12 minutes in the preheated oven, until lightly browned. Cool on baking sheets for a few minutes before transferring to wire racks to cool completely.
Interesting Facts
The name "snowdrop" is thought to be a reference to the white granulated sugar coating the cookies.
These cookies are a popular treat in the American south.
These cookies can be stored in an airtight container for up to 1 week.