As you are brewing tea, what happens when you let hot water inside the teapot for a long time?
The tea overbrews. Unless it is excellent, it will become bitter and/or astringent. The same also applies to leftovers, tea that stays inside the teapot because it hasn't been completely emptied.
See for yourself! Next time you make tea, see if you pour all your tea out. Once you think you're done, open the lid and pour again over a cup while slowly moving your teapot right and left. Do so until the very last drop.
How did you do? How much tea still came out?
- Nothing: high marks! You know the Way of the Tea! Lu Yu has reserved a seat and a tea cup for you in Heaven.
- 1 or 2 drops: quite good, you're almost there!
- Several drops: OK. Be more focused next time!
- A little stream: Bad. It's time to read all my tea lessons again or, at least, finish this article.
It wasn't easy to get all the tea out when the lid was closed. So, the first solution is to use your finger (thumb or index) to open the lid when you finish pouring your tea. See here:
Secondly, be patient and relaxed. Take a few more seconds to slowly move the pot in different direction to get all the tea to come out. It will both bring more flavors to this cup (since the last drops are the most concentrated) and make the next brew better!