01 - Place dark chocolate, milk chocolate, and unsalted butter in a heatproof bowl. Set the bowl over a saucepan of gently simmering water, stirring constantly until all ingredients are fully melted and incorporated. Remove from heat, then blend in heavy cream until the mixture is smooth. Allow to cool slightly.
02 - Line an 8-inch square pan with parchment paper. Pour the cooled chocolate mixture into the pan and spread evenly with a spatula.
03 - Distribute the crushed pistachios, digestive biscuits, and toasted coconut flakes evenly over the chocolate base. Press gently to ensure the crunchy ingredients adhere to the chocolate.
04 - Combine pitted dates, water, ground cardamom, and salt in a small saucepan over low heat. Stir continuously until the dates are softened and most of the water is absorbed, about 5 minutes. Transfer mixture to a blender or process with an immersion blender until completely smooth.
05 - Spoon or swirl the spiced date caramel over the chocolate crunch base.
06 - Place the pan in the refrigerator for at least 2 hours, allowing the dessert to set fully.
07 - Lift the set dessert from the pan using the parchment paper. Slice into bars or squares with a sharp knife. Adorn with edible gold leaf, dried rose petals, and extra chopped pistachios prior to serving.