What is green tea?

Green tea is tea whose oxidation was stopped deliberately, within hours of picking, by applying heat. How that heat is applied — steam or a hot pan — is the single biggest variable in the category.

tea type

What is being compared

Point by point

AspectGreen teaWhite tea
The defining decisionHeat applied early to destroy the oxidising enzymes.No heat step at all. The leaf is withered and dried.
Is it unoxidisedEssentially yes — fixing stops the process deliberately.Not quite. Slow oxidation occurs during the long wither, despite the common description.
Processing stepsFix, shape, dry — three steps, quickly.Wither and dry. Fewer steps, over a much longer period.
FlavourGrassy and marine if steamed; nutty and toasted if pan-fired.Hay, melon and light honey, with far less intensity.
BrewingCooler water, around 70–80 °C. The least forgiving category of boiling water.Warmer than green tea tolerates, and much more forgiving.

The short answer

Green tea’s reputation for bitterness is a brewing problem rather than a property. The same leaf at 70 °C and at boiling are different drinks.

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