@ cwatters, Retired BA/BY,
I am in extreme trouble when I read English PPRuNers would prepare my favorite VFTOP Darjeeling with boiling water .
Thank Our Lord he helps the stewardess to avoid such shame...
To do "tea" undrinkable, use water over 60°c, wait more than 3-5 min to drink it, use more than one teaspoon for one cup of tea, use bad water or already preboiled water.!
No wonder pilots crash the aircraft, and passengers are terrified in flight if you are over boiling water with pressure... and insurance refuse to pay damage!