In separate bowls, soak each dried ingredient in hot water for 30 minutes. Strain then rinse all ingredients except for the longan. Reserve the soaking liquid for the longan.
Rinse the seaweed thoroughly until it no longer feels slimy. Cut down into 2-3 inch lengths.
Trim and discard the hard stem of the snow fungus. Hand tear into bite-sized pieces.
In a small stockpot, simmer the pearl barley for 30 minutes or until tender. Strain then rinse until the water runs clear.
In the meantime, in a separate medium-sized stockpot, bring 6 cups of water to a boil and simmer the dates for 10 minutes.
Add the longan along with its soaking liquid and simmer for 10 minutes.
Add goji berries and the previously cooked pearl barley. Add rock sugar to taste.
Add snow fungus and seaweed. Simmer for 5 minutes then turn off the heat.
Allow the Sam Bo Luong to cool completely to room temperature then refrigerate. Serve chilled with ice cubes or crushed ice.