Place Thai tea mix in a heatproof pitcher or a tea sock. Pour hot water over the Thai tea mix. Steep for 5 minutes.
Strain the tea into a separate mug or glass, discarding the tea leaves.
Add granulated sugar and sweetened condensed milk to the hot tea. Stir until the sugar is fully dissolved.
Fill serving glasses with ice cubes. Pour the sweetened tea over the ice.
Drizzle evaporated milk over the top of each glass before serving.
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