01 - Place dark chocolate, milk chocolate, and unsalted butter in a heatproof bowl. Set over a pan of gently simmering water and melt, stirring until completely smooth. Take off the heat and blend in the heavy cream. Allow to cool slightly.
02 - Line an 8-inch square pan with parchment paper. Pour the chocolate mixture into the pan and spread evenly.
03 - Evenly scatter crushed pistachios, digestive biscuits, and toasted coconut flakes on top of the chocolate base. Compress gently with a spatula to set the toppings.
04 - Combine pitted Medjool dates, water, ground cardamom, and sea salt in a small saucepan. Cook over low heat, stirring, until the dates soften and water is mostly absorbed, about 5 minutes. Transfer to a blender or use an immersion blender to process until smooth.
05 - Spoon or swirl the spiced date caramel over the crunchy chocolate base.
06 - Refrigerate for a minimum of 2 hours, until completely firm.
07 - Remove from the pan and slice into bars or squares. Decorate with edible gold leaf, dried rose petals, and extra chopped pistachios prior to serving.