In a large bowl, sift together the flour, baking soda, cinnamon, cloves, nutmeg, ginger, and salt and then combine the mixture with your hands. In the bowl of an electric mixer fitted with the paddle attachment, beat the brown sugar, oil, and molasses on medium speed for 5 minutes. Turn the mixer to low speed, add the egg, and beat for 1 minute. Scrape the bowl with a rubber spatula and beat for 1 more minute. With the mixer still on low, slowly add the dry ingredients to the bowl and mix on medium speed for 2 minutes. Add the crystallized ginger and mix until combined.