To ensure the chocolate bark sets, follow these steps:
Line a rimmed baking sheet or tray with parchment paper, providing it's flat and wrinkle-free. Using a spatula, evenly spread the melted chocolate onto the parchment paper. Add the pistachios and rose petals as toppings, gently pressing them into the chocolate. Transfer the baking sheet to the freezer and let the chocolate set for 30 minutes. The cold temperature will help the chocolate set quickly and ensure a firm, even texture. Once the chocolate sets, please remove it from the freezer and cut it into pieces with a sharp knife. Enjoy your Keto Pistachio Rose Chocolate Bark at room temperature or slightly chilled for the best taste and texture.