I have heard that drinking green tea is good for health. I purchased some tea bags from supermarket and I did not like the taste at all (bitter and rough). Are all green teas like that?
premium green teas should not be bitter at all, or if slightly bitter but quickly turns into a sweet and refreshing aftertaste (回甘). The reason most of the tea bags taste bitter is because they are mostly made of low quality teas and severely oxidised due to the increased surface of the broken leaf edges.