01 - In a heatproof bowl, combine dark chocolate, milk chocolate, and unsalted butter. Melt over a double boiler, stirring until fully smooth. Remove from heat and blend in heavy cream until incorporated. Allow to cool slightly.
02 - Line an 8-inch square pan with parchment paper. Pour the chocolate mixture into the pan, smoothing the surface evenly.
03 - Scatter crushed pistachios, digestive biscuits, and toasted coconut flakes over the chocolate base. Gently press the toppings into the chocolate with a spatula to secure the layer.
04 - Combine pitted dates, water, ground cardamom, and sea salt in a small saucepan. Cook over low heat for approximately 5 minutes, stirring until dates are soft and water is mostly absorbed. Puree the mixture until smooth using a blender or immersion blender.
05 - Spoon or swirl the date caramel evenly across the crunchy base. Transfer to the refrigerator and chill for at least 2 hours until fully set.
06 - Lift the set mixture from the pan and cut into bars or squares with a sharp knife. Garnish with edible gold leaf, dried rose petals, and additional chopped pistachios prior to serving.