Preheat the oven to 325°F.

In a large bowl, combine the flour, brown sugar, baking powder, baking soda, ginger, cinnamon, nutmeg, cloves, pecans, and raisins. Stir.

In another bowl, stir the molasses, eggs and orange zest until well blended.

Add the wet ingredients into the dry ingredients and stir until the dough comes together (it will be sticky).

Turn the dough out onto a lightly floured surface and gently knead the dough a couple of times until it comes together.

Separate the dough into two logs. Place the logs onto a baking sheet that has been covered with either parchment paper or a silpat mat. Flatten the logs with the palm of your hand.

Bake on the middle rack for about 35 minutes, or until lightly browned and risen.

Allow the logs to cool enough to handle. On a cutting board with a serrated knife, cut the biscotti at an angle into about 3/4" pieces.

Lay the biscotti on their side back on the baking sheet in an even layer. Bake for another 10 minutes or until dry.

Allow the biscotti to cool completely.

Over a double boiler, melt the chocolate. Dip either one end of the biscotti or an entire side into the melted chocolate. Place on a piece of parchment paper or silpat mat to harden.

Once completely cooled and hardened, store in an airtight container for up to 2 weeks.