Melt the dark chocolate in a double boiler or microwave, stirring until it is smooth and creamy.
Incorporate spices and mix-ins by adding ground cardamom, cinnamon, and a pinch of sea salt for an aromatic Middle Eastern flavor.
Incorporate Nuts and Fruits: Gently fold in the chopped pistachios, almonds, and dates to ensure they are evenly distributed throughout the chocolate mixture.
Spread and Shape: Pour the mixture onto a parchment-lined baking sheet, spreading it into a rectangle about 1/4 inch thick.
Drizzle melted white chocolate over the dark chocolate layer for a beautiful contrast.
Let the chocolate set at room temperature, or refrigerate it for faster results.
Once it has set and hardened, break it into bars.