01 - Preheat oven to 350°F. Grease and line a 9x5-inch loaf pan with parchment paper.
02 - In a large bowl, whisk together flour, ground ginger, cinnamon, cloves, nutmeg, baking soda, and salt.
03 - In a separate medium bowl, whisk vegetable oil, dark brown sugar, and eggs until smooth; stir in molasses and buttermilk.
04 - Pour wet mixture into dry ingredients and gently combine until just mixed; avoid overmixing.
05 - Fold in raisins or crystallized ginger if desired.
06 - Pour batter into prepared loaf pan and smooth the surface.
07 - Bake for 50 to 55 minutes or until a toothpick inserted in the center comes out clean.
08 - Let the loaf cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.