01 - Place dark chocolate, milk chocolate, and unsalted butter in a heatproof bowl. Set over a saucepan with gently simmering water, stirring until fully melted and smooth. Take off the heat and mix in heavy cream until fully incorporated.
02 - Line an 8-inch square pan with parchment paper. Pour chocolate mixture into pan and spread into an even layer using a spatula.
03 - Scatter crushed pistachios, digestive biscuits, and toasted coconut flakes evenly over chocolate base. Gently press down to embed crunch layer into the chocolate.
04 - Combine pitted dates, water, cardamom, and salt in a small saucepan. Cook over low heat, stirring, until dates are soft and water is absorbed, around 5 minutes. Blend until smooth using a blender or immersion blender.
05 - Add dollops of date caramel over the crunchy chocolate base, swirling with a spatula. Refrigerate uncovered for at least 2 hours or until set.
06 - Remove set creation from pan, then cut into bars or squares. Garnish with edible gold leaf, dried rose petals, and additional chopped pistachios before serving.