In a large bowl, mix together the flour, salt, and baking soda. Set aside.

In the bowl of your stand mixer, add softened butter and sugar. Beat until fluffy.

Add egg, lemon juice, lemon zest, vanilla extract, and food coloring (if using) to the butter and sugar mixture. Mix until combined.

Slowly add the dry ingredients to the stand mixer. Mix until just incorporated.

Cover the bowl with plastic wrap and refrigerate for 2 hours.

Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

Using a small cookie scoop or your hands, scoop portions of dough and roll them into balls.

Roll each dough ball in regular sugar first, then in powdered sugar.

Place the dough balls on the baking sheets, keeping them 2 inches apart. Bake for 10-12 minutes, or until slightly golden on the edges.

Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to cooling racks.