If your green tea does taste bitter, it will either be a poor quality tea, or it has been brewed incorrectly.
Choose loose leaf tea ~ tea bags usually contain the tea dust, also known as ‘fannings’(1) left over from the leaf, which often have a bitter taste.
And the tea bag itself, unless it’s organic, usually contains a number of toxins, which apart from the bitterness, present a number of health risks(2).
A water temperature between 75-85 Celsius (165-185 F) will give you a sweet tasting tea. If your water is too hot it will burn the delicate tea leaves, resulting in bitterness.
Having said that, if you like your green tea bitter ~ and a fine green tea certainly is a Goldilocks(3) thing ~ by all means brew your tea that extra minute or two to achieve a bitter taste.
So create the time to be centred in your moment when you make your tea(5), find your Goldilocks~taste, sip slowly and joyously, and be at one with the world… Relish… And may your magick serve you well. ~ GreenWitch Tea