Make the Dough: Sift together the flour, baking soda, cinnamon, cloves, nutmeg, ginger, cayenne pepper, black pepper and salt. Whisk to combine. In another bowl, combine the brown sugar, oil, molasses and soy milk. Add the dry ingredients to the wet ingredients in two stages. Mix thoroughly to combine. The dough will be very stiff. Finally, stir in the crystallized ginger until it’s evenly dispersed.