In a deep saucepan, combine green tea leaves, baking soda, and cold water. Bring to a boil, then simmer for 10-15 minutes until reduced by half.

Add ice-cold water to the tea mixture and whisk vigorously for 1-2 minutes to aerate.

Incorporate crushed cardamom pods and simmer gently for an additional 5 minutes.

Strain the tea concentrate into a clean pot and gradually add warm milk while stirring continuously.

Taste and add salt or sugar as desired, stirring well.

Garnish each cup with crushed pistachios, almonds, or dried rose petals before serving.