In a medium-sized bowl, whisk together the flour, cocoa, ground ginger, cinnamon, nutmeg, ground cloves, baking soda and salt. Set aside.
In a separate large bowl, beat together the butter and brown sugar until creamy.
Then mix in the egg, molasses and vanilla extract.
Turn off the mixer and scrape down the bottom and sides of the bowl.
Add the flour mixture into the butter mixture about ½ at a time and beat together starting on a low speed until incorporated.
Cover the bowl with plastic and refrigerate for at least 1 hour our up to 48 hours.
When ready to bake, preheat the oven to 350F (180C) or 325F (170C) on a convection oven (some convection ovens make this adjustment automatically). Line cookie trays with parchment paper or silicone baking mats.
Pour the coarse sugar onto a small plate.
Form the dough into balls with about 1 to 1.5 tablespoons of dough each (I do this using a cookie scoop). Each will be somewhere in between the size of a ping pong ball and a golf ball (likely a little smaller than a golf ball). Roll each dough ball in the sugar.
Place the cookies 1.5 to 2 inches (about 3.5-5 cm) apart on the lined cookie sheets.
Bake 1 cookie sheet at a time in the middle of your oven for 8-11 minutes or until the tops look just set.
Cool the cookies on the cookie sheets for at least 10 minutes, then carefully transfer to a cooling rack to continue cooling.