Sejak

Where it grows

The districts recorded against this tea, all of them in South Korea. Elevation is given as the band the district is recorded at, not a measurement of the garden this leaf came from.

• Hadong — 100–700 metres

  How firm this is: Inferred from general knowledge of the district rather than measured or taken from a source that states it.

The plants it is made from

Cultivar is the level below the variety group: a named selection of the tea plant, propagated as clones from one parent. Most consumer writing stops at the country and the category, which leaves out the layer that decides how the leaf behaves before anyone picks it.

• Jaerae-jong — Camellia sinensis var. sinensis

  Small-leaf, cold-hardy and variable bush to bush, with deep taproots from seed. Picked in successive spring grades from ujeon through daejak.

How it is made, in order

Read top to bottom: the list is the production sequence, and the sequence is what makes this tea its category rather than a neighbouring one. The same leaf from the same bush becomes a green tea or a black tea depending on where the heat falls relative to the bruising, so reordering these steps would not vary the tea — it would produce a different one.

1. 1. Kill-green (fixation) — Denatures polyphenol oxidase and related enzymes, arresting enzymatic oxidation.
2. 2. Rolling and shaping — Ruptures cell walls to expose leaf juices, and forms the leaf into the shape it will hold through drying and storage.
3. 3. Drying — Reduces residual moisture to a level at which enzymatic, microbial and oxidative change effectively stops, stabilising the leaf for storage.

The route it is made by

The steps above are what happens; this is the named production route they belong to, with the other teas made the same way.

• Chinese pan-fired green tea — Heat first, shape second. The route puts fixation at position three, before the leaf has been ruptured at all, and everything that follows happens to a leaf that has stopped changing colour.

  Where it is practised: Practised across almost every Chinese producing province, and in Korea, Vietnam and increasingly in Japanese kamairicha production, where it is the minority method.

What its chemistry turns on

Every true tea contains caffeine, catechins and amino acids, so listing them would say nothing about this one. What differs is what the processing above does to them — and that is the same list of steps, read for its chemistry instead of its craft.

• Kill-green (fixation)
  • locks 2-Phenylethanol
  • locks Anthocyanins
  • locks Catechins
  • locks cis-3-Hexenol
  • locks Green-leaf volatiles
  • locks L-theanine
  • locks Leaf lipids
  • locks Methylated catechins
  • locks Theogallin
• Rolling and shaping
  • converts Leaf lipids
  • creates Theaflavins
  • raises Pectins
• Drying
  • creates Strecker aldehydes
  • raises Beta-damascenone
  • raises Thearubigins

These are statements about the leaf and the cup. What any of these compounds does in a body is a different kind of question and is not answered here or on the pages linked from it.

History

Korean tea cultivation dates from the ninth century and was nearly extinguished by the Joseon dynasty’s suppression of Buddhist institutions, surviving around temples. The grading system by picking date is part of the twentieth-century revival.

TeaHQ synthesis — TeaHQ's own reading of well-attested general knowledge, with no single source behind it.

Brewing

• Western brewing (teapot or mug)

  1.5–2.5 g/100 ml · 70–80 °C · 1 authored infusion

  Needs: Western teapot

  Open in the brew assistant

• Gongfu brewing (gaiwan)

  3–4 g/100 ml · 75–85 °C · 4 authored infusions

  Needs: Gaiwan

  Open in the brew assistant

• Korean green tea brewing

  2–3 g/100 ml · 60–75 °C · 3 authored infusions

  Needs: Water cooling bowl (sukwoo), Porcelain teapot, Yunomi (Japanese teacup)

  Open in the brew assistant

When the cup goes wrong

Written against green tea as a category rather than against this tea in particular, and worked back from the symptom to the likely causes in order. 37 apply to the category; the first 6 are shown.

• I bought a big bag to save money and it was stale before I finished it — A large quantity bought at a good unit price faded well before it was drunk, so the saving turned into waste.
• I bought a water filter for my tea and it changed nothing — A filter jug or tap filter was bought specifically to improve the tea, and the cup tastes the same as it did before — with the same dullness, the same film and the same scale in the kettle.
• I have too many teas open and most of them are going stale — A dozen or more packets are open at once, three or four get drunk regularly, and the rest fade quietly on the shelf until they are thrown away.
• Leaves stick to the cup, the pot and my teeth — Fine leaf clings to the inside of the vessel, comes through into the cup, and ends up in the last mouthful.
• My bamboo whisk is losing tines — Fine bamboo tines snap off during whisking and turn up in the bowl, and the whisk feels stiff and splayed.
• My cold brew tastes like faintly flavoured water — After a night in the fridge the jug is pale and tastes of very little, with none of the sweetness cold brewing is supposed to give.

Every diagnosed brewing problem

If you like this

Grouped by why they were suggested, strongest reason first. Nothing here is a blended score — a suggestion appears under the best reason that exists for it, and never under a weaker one as well.

Compare this tea with another

Where this tea is drunk

Documented practices that name this tea. Each page describes what is done and by whom, and separates what is recorded from what is repeated.

• Hadong and Boseong: two Korean tea districts that are not alike — One district grows seed-propagated bushes scattered through woodland on the slopes of a mountain; the other has contoured rows photographed more often than any other tea field in Asia. Both are called Korean tea and they are different products with different economics.
• Korean temple tea — The Buddhist monastic lineage that carried Korean tea through the centuries when almost nobody else was drinking it — the temple gardens of the south-west, the monks who wrote about it, and the temple-stay programmes through which most outsiders now meet it.

Guides covering this tea

• Grading by picking date: the East Asian alternative to grading by appearance