Soak the pearl barley in boiling water for 30 minutes. Change the water when it has cooled. Drain the pearl barley afterward.
Soak the lotus roots and water chestnuts in an ice bath for 20 minutes.
Rinse the rest of the ingredients (seaweed, goji berries, red dates, etc.), then soak them in water for 20 minutes.Once the snow fungus has softened, cut it into bite-sized slices. Pour water into the pot. Then, add the lotus seeds and pearl barley and cook them for 30 minutes over medium heat.Cover the pot to help the seeds soften quicker and prevent too much water from evaporating during boiling. After 30 minutes or when the lotus seeds and barley have tenderized, add the lotus roots, water chestnuts, and red dates into the pot.Cover and continue to cook for 20 minutes Next, add the longan, snow fungus, and rock sugar. Cook for another 5 minutes over medium-low heat.
Add seaweed, goji berries, and chia seeds. Cook them for about 2 to 3 minutes, then cut the heat.
Allow the sweet soup to cool, then ladle it into a bowl or cup. Add a few drops of banana flavoring oil to boost the taste and aroma.
Serve chè sâm bổ lượng chilled, or add some ice cubes.