01 - Combine the chopped dark chocolate, milk chocolate, and butter in a heatproof bowl. Melt slowly over a pan of simmering water, stirring until a glossy mixture forms. Remove from heat and blend in heavy cream until fully integrated. Let cool slightly.
02 - Line an 8-inch square pan with parchment paper. Pour and spread the chocolate mixture evenly into the pan.
03 - Evenly distribute the crushed pistachios, digestive biscuits, and toasted coconut flakes on top of the chocolate base. Use a spatula to gently press the toppings into the mixture.
04 - In a small saucepan, combine the pitted dates, water, ground cardamom, and fine sea salt. Cook over low heat, stirring frequently, until the dates are soft and the water has mostly evaporated, about 5 minutes. Blend the mixture until completely smooth.
05 - Dollop or swirl the pureed date caramel over the crunchy chocolate base to create a marbled effect.
06 - Chill the pan in the refrigerator for a minimum of 2 hours until firm and set.
07 - Remove the chilled creation from the pan. Slice into bars or squares as desired. Decorate with edible gold leaf, dried rose petals, and additional pistachios before serving.