"Create a bulk artisan chocolate bar recipe named '1998' using only these ingredients: 70% dark fine cocoa chocolate, rum-infused raisins, vanilla powder, cinnamon powder, and nutmeg powder. The recipe should be unique, balanced, and approachable for people who are hesitant about dark chocolate. Make it suitable for 12 bars of 100 g each, use metric units, and keep the method beginner-friendly and practical for small-batch production. Do not add any other flavor ingredients beyond these listed ones."