Regional styles of oolong - oxidation, shape, roasting: three keys to understanding what you are drinking

Under the word "oolong" lies an entire family: the Da Hong Pao from Fujian, the Tieguanyin from Anxi, the Dan Cong from Chaozhou, the high-mountain teas from Taiwan. Why are these teas so different when they all come from the same leaves? Three parameters - oxidation, shape, roasting - explain almost everything.

The word "oolong": a family, not a tea

In Chinese, oolong is written 烏龍 - "the black dragon". It is an extremely broad category of teas that are said to be partially oxidized: somewhere between green tea (little or no oxidation) and black tea (highly oxidized). In practice, you will find teas under this name with 10% oxidation - almost green, floral, very fresh - and teas with 80% oxidation, almost brown, woody, long in the mouth. In between, a whole world.

To find your way around, three questions are enough: what oxidation rate? what shape? what level of roasting? These are the three main parameters that, alone, define the identity of an oolong.

1. Oxidation - the degree of leaf opening

After harvesting, the leaf is left to wither and then "shaken" more or less vigorously to initiate oxidation (the cells of the leaf break, the enzymes act, the leaf gradually browns). The artisan stops the oxidation at the moment deemed good, by a passage at high temperature (fixation).

• Low oxidation (10-30%): light color, floral, milky, fresh vegetable notes. Examples: Baozhong from Taiwan, green Tieguanyin from Anxi (Fujian), high mountain oolongs (Alishan, Lishan, Shan Lin Xi - Taiwan).
• Medium oxidation (40-60%): amber color, fruity aromas (peach, apricot, plum), honey. Examples: traditional Dong Ding (Taiwan), some Dan Cong from Chaozhou.
• High oxidation (65-80%): copper to dark color, woody, cocoa, ripe fruit, tobacco notes. Examples: Da Hong Pao (Fujian), Oriental Beauty (Taiwan), some Rou Gui.

2. The shape - the gesture that bends the leaf

Each region has its own way of shaping the finished leaf. This shape is not decorative: it conditions the opening to infusion - speed, homogeneity, aromas released.

• Leaf rolled into a tight ball (typical of southern Fujian - Anxi - and Taiwan): the leaf opens slowly, the infusion unfolds over several passes. Ideal for green and floral oolongs. Tieguanyin is the canonical example.
• Long twisted leaf (typical of Wuyi in northern Fujian and Chaozhou in Guangdong): the leaf is rolled into an elongated spiral, almost like a wire. It opens faster, releases more concentrated aromas at the entrance. Da Hong Pao and Dan Cong have this shape.
• Light ball leaf with stem (Dong Ding, old Taiwanese oolongs): a compromise between the two - the infusion spreads at mid-speed.

3. Roasting - the fire gesture

After drying, many oolongs are roasted - passed at moderate temperatures (60-140°C) for several hours, sometimes several days, often over charcoal in the Wuyi and Chaozhou traditions. Roasting is not cosmetic: it deeply transforms the personality of the tea.

• Non-roasted or very light roasting: primary aromas (flowers, vegetable, milk), great freshness. What you find in green oolongs, Baozhong, high-mountain teas.
• Medium roasting: honey, cooked fruit, brioche notes. Sweetness and depth.
• Strong roasting (the yancha of Wuyi, some Dan Cong roasted over charcoal): cocoa, coffee, roasted nuts, incense, tobacco notes. Long finish in the mouth.

A same oolong roasted 3 times in 6 months has nothing to do with its non-roasted version - it's almost another tea.

A quick overview of the major regions

• Northern Fujian (Wuyi): the yancha (岩茶, "rock tea"), twisted, often strongly roasted. Da Hong Pao, Rou Gui, Shui Xian, Tie Luo Han. Rock minerality, cocoa, wood.
• Southern Fujian (Anxi): the Tieguanyin rolled tightly. Green version (floral, milky) and roasted version (honey, cooked).
• Guangdong (Chaozhou): the Dan Cong (單欉), twisted, unique for their aromatic palette (mimosa, orchid, ginger, almond) - each cultivar is named after its dominant aroma.
• Taiwan: the high-mountain (Alishan, Lishan, Shan Lin Xi) - tightly rolled, very floral, little oxidized. The more roasted traditional Dong Ding. Oriental Beauty (Dongfang Meiren), strongly oxidized, with honey and ripe peach aromas, bitten by the small cicada before harvest.

What it changes to the infusion

A green oolong, little oxidized, tightly rolled, without roasting: water at 85-90°C, very short time, in a gaiwan. You drink clear and floral.

A Wuyi oolong, twisted, strongly roasted: water at 100°C, a little longer time, in a small Yixing teapot that absorbs well the roasting. You drink dense and mineral.

A same tea will change face in three infusions: this is what makes it rich - and Gong Fu Cha (see our previous publication) is the format that reveals it best.

The little advice to explore

Do not first look for the "best" region: look for a category that you like. If you like very fragrant, floral teas: start with a green Tieguanyin or a high-mountain from Taiwan. If you like roasted coffees, old wines: start with a Da Hong Pao or a Rou Gui. If you are curious about ripe fruits: an Oriental Beauty or a Dan Cong Mi Lan Xiang.

Once a door opens, the other invites itself.