01 - In a heatproof bowl set over a double boiler, melt together dark chocolate, milk chocolate, and unsalted butter. Stir frequently until smooth. Remove from heat and incorporate heavy cream. Allow to cool slightly.
02 - Line an 8-inch square pan with parchment paper and evenly spread the chocolate mixture into the pan.
03 - Distribute crushed pistachios, digestive biscuits, and toasted coconut flakes over the chocolate base. Gently press down with a spatula to embed the crunch layer.
04 - Combine Medjool dates, water, ground cardamom, and fine sea salt in a small saucepan over low heat. Cook, stirring, until dates have softened and water is mostly absorbed, approximately 5 minutes. Puree until smooth using a blender or immersion blender.
05 - Dollop or swirl the date caramel over the crunchy chocolate base.
06 - Refrigerate the pan for a minimum of two hours, or until thoroughly set.
07 - Lift from the pan and slice into bars or squares. Garnish with edible gold leaf, dried rose petals, and additional chopped pistachios just before serving.