In a wide & small bowl, whisk together 4 tablespoon pistachio cream, ¼ teaspoon green cardamom powder, ¼ cup heavy cream and 1 cup whole milk until fully combined. Your pistachio cream milk is now ready.
In a seperate large mixing bowl, combine ⅓ pistachio cream, softened mascarpone cheese, green cardamom powder, sugar, and ice-cold heavy cream.
Using a hand mixer, beat for 2-3 minutes until the mixture is smooth and creamy. Don't overheat else the mixture could seperate or become overly thick and wont be spreadable.
Working one at a time, dip each ladyfinger into the pistachio milk for 2–3 seconds, flipping to coat both sides. Be careful not to soak them too long, or they may become soggy and fall apart.
Arrange the milk dipped ladyfingers in a single layer in your serving dish(8by8 pan works fine). Then use a spatula to gently spread half of the mascarpone-pistachio mixture evenly over them.
Sprinkle 1 tablespoon crushed pistachios over the layer, if desired, for added texture and flavor.
Repeat with another layer of dipped ladyfingers, followed by the remaining mascarpone cream mixture. Smoothen it out to fully cover the top.
Lightly warm a small amount of pistachio cream(makes it easier to spread and drizzle). Pour it over the surface. Spread it thinly to cover the top and add a glossy finish.
Refrigerate for at least 6 hours, preferably overnight, to allow the dessert to fully set.
Just before serving, decorate as you like. I like to add extra chopped pistachios for they add a delightful crunch and contrast of texture.Slice carefully and serve chilled!