In a large bowl, add softened butter, sugar, and zest with an electric mixer until lighter in color.
Add vanilla, salt, lemon juice, and food coloring.
In a separate bowl, sift flour, cornstarch, baking powder, and baking soda. Whisk together.
Gradually fold it into creamed mixture with a spatula. Cover dough and chill in fridge for 1 hour.
Preheat oven to 350℉. Line two baking sheets with parchment paper.
Scoop with cookie scoop. With hands, roll into a ball. Place them in granulated sugar first, then in powdered sugar. Repeat with the rest of the dough.
Place on baking sheet two inches apart.
Bake for 12-14 minutes. Let cool for 1 minute to cool.