Чому мій чай гіркий?
Even expensive teas end up bitter when I brew them.
Almost always one of three things: water too hot, steeping too long, or too much leaf for too little water. For green tea specifically, use 75-80°C water and 60 seconds maximum. Bitterness is how over-extracted catechins taste — reduce any of those three variables and it disappears.
— Mei C., 931 Tea