In a medium bowl, whisk together the flour, baking soda, spices, and salt. In a separate medium-size bowl, whisk together the egg, butter, sugar, molasses and dark brown sugar. Add the wet ingredients to the dry, and stir with a stout spoon just to combine. Chill the dough in the fridge for 20 minutes.
While the dough is chilling, arrange racks in the upper and lower third of the oven, and heat the oven to 375°F. Also, line 2 baking sheets with parchment paper.
Pour some granulated sugar (about 1/3 cup) into a small bag or pie plate. Tear off tablespoon-size clumps of dough, and roll them, between the palms of your hands, to form balls. Drop a few balls at a time into the bag of sugar, and shake the bag to the coat the balls. If your sugar is in a pie plate, simply roll the balls in the sugar to coat them. Space the balls
about 2 inches apart on the prepared baking sheets.
Bake, rotating the sheets halfway through, until the cookies puff and their tops develop cracks -- 8 to 10 minutes. Cool on the sheets for 5 minutes, then transfer to wire racks for further cooling. Enjoy with coffee, tea, or fine champagne.