Soak red beans overnight or for at least 4 hours. Drain.
Add soaked red beans and water to a pot. Bring to a boil, then reduce heat and simmer until soft.
Add rock sugar and continue to simmer until dissolved and red beans are tender and slightly thickened. Let cool.
Place black tea bags in a heatproof mug or pot. Pour boiling water over tea bags. Steep.
Remove tea bags. Stir in evaporated milk and condensed milk until well combined. Let cool completely, then chill.
In a tall glass, add a layer of sweet red beans.
Fill the glass with crushed ice.
Pour the chilled milk tea over the ice.
Add another scoop of sweet red beans on top, if desired. Serve immediately.
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