Place ½ cup turbindado or granulated sugar in a bowl with ½ teaspoon of the gingerbread spice mix.
In a large bowl, beat 1 cup unsalted butter, 1 cup dark brown sugar and ¼ cup white sugar with an electric mixer until light and fluffy, about 2 minutes.
Add ¼ cup molasses, 2 eggs and 1 teaspoon vanilla extract and mix well.
Sift the dry ingredients: 2 ¾ cup all-purpose flour, 1 teaspoon baking soda, 1 teaspoon cream of tartar, 3 teaspoons gingerbread spice mix and ½ teaspoon salt. Add them to the butter mixture and mix until well combined.
Cover the bowl with plastic wrap and place in the refrigerator for about 1 hour, or until firm enough to roll.
Preheat the oven to 350°F (180°). Line a cookie sheet with parchment paper or lightly grease it.
Use a cookie scoop and make walnut-sized balls with your palms.
Roll each ball in the turbinado sugar and place them on the prepared baking sheet about 2 inches apart so they can grow during baking. If baking in batches, keep the unused dough refrigerated.
Bake for 10 to 12 minutes, or until the edges start to turn slightly golden and dry but the center is still soft.
Place on a cooling rack and let the cookies cool completely.
Repeat with the remaining dough until all the cookies are baked.