BRING water, galangal and lemongrass to boil in saucepan. Boil 5 minutes. Remove from heat.
ADD tea bags. Steep for 20 minutes. Strain mixture to remove galangal, lemongrass and tea bags. Add sugar; stir to dissolve.
MIX sweetened condensed milk and coconut milk in small bowl until well blended. To serve, pour 1 cup tea mixture over ice in 4 tall glasses. Stir 2 tablespoons milk mixture into each glass until well blended.