In a small bowl, stir together corn flour and 1 cup milk.

In a saucepan over high heat, stir together 2 cups milk, sugar, one crushed cardamom pod and flavor of your choice. Bring to a boil. Stir the corn flour and water in another bowl pour mixture into the saucepan. Reduce the heat to low, and allow to cool slightly; then stir in thick cream and followed by condensed milk, stirring constantly until the cream is thickened. Pour the thickened sauce through a mesh to eliminate any lumps and to obtain a smooth texture. Allow to cool momentarily, then pour into individual bowls or one large serving bowl. Sprinkle powdered pistachio nuts on top. Cover with cling film and refrigerat.