Soak almond gum (badam pisin) in water overnight until it swells into a jelly-like texture.
Prepare or use ready-made sarsaparilla (nannari) syrup.
Boil milk and reduce it slightly until it thickens; let it cool completely.
In a tall glass, add 2 tablespoons of soaked almond gum.
Pour in 2–3 tablespoons of nannari syrup.
Add chilled reduced milk over the mixture.
Top with a scoop of ice cream (traditionally badam or vanilla).
Mix gently and serve chilled.