A Tea Addict's Journal

Although the natural environment in which teas grow obviously affect how they taste, processing, for oolongs at least, is king.  The sheer number of variables is astounding, and the range of tastes that are possible, from the really light and floral baozhongs to the really dark and heavy wuyis are what make oolongs so much fun (and why so many people drink them).

I’ll try to proceed in the order in which these things happen in the production process: oxidation, rolling, roasting, aging.

Oxidation is the first step in oolong production that makes it distinct from green teas, and it really happens immediately after the tea leaves are plucked.  When leaves get harvested, they usually go through a withering stage, and then they are bruised so that the cell structure breaks down, so that the enzymes can get to work and oxidation can begin. How much bruising, how much time for oxidation, under what conditions, etc, are the kinds of things that create particular flavours in a tea and are also the domain of a master tea maker. I suspect, for example, that darjeeling oolongs have generally turned out to be similar to their first flush is because they haven’t quite gotten the hang of the oxidation process yet, so everything still taste sort of vaguely similar.  I have talked to folks who tell me that they have to control for everything from weather, to time of day, to moisture level in the air, etc, and they know when to stop the oxidation process and start the kill-green by the way the leaves look and smell.  That’s stuff that I think I will only be able to learn if I become a tea farmer and work on it for thirty years.

The kill-green stops the oxidation process, and then you have to roll the tea — literally rolling them in the old days, in cloth bags with the farmer’s feet doing the rolling.  These days, that’s more often than not done with a rolling machine.  The purpose of rolling here is more or less like the purpose of rolling for puerh — squeezing out liquids, and basically allowing a lot of the dissolvable materials to stick on the surface of the leaves rather than remaining inside.  The rolling process can take a while, and depending on the area in which this is happening, rolling will also determine, to a large extent, the final shape in which the tea takes.  Just look at any dancong and compare it to a Taiwanese gaoshan oolong and you’ll know what I mean.

The drying and roasting process is then the step in which tea becomes tea — drinkable, brewable leaves.  This can be done in different ways, but generally speaking, this is mostly done through machines again.  At what temperature and for how long is really a matter of the craft of the teamaker again, because the retained moisture at the end of this process affects how the tea will taste by the time it gets to you.  Even though leaves look dry, there’s always some moisture in them, and the amount of drying/roasting that it goes through affects this value, which then changes the way it keeps and the way it ages through time.  That’s why, for example, vacuum sealed packs of somewhat wet leaves don’t keep too long and need to be left alone in the fridge — they go bad, fast.

Generally speaking, the drier the leaves, the longer/better they keep.  Roasting is a process through which moisture gets taken out of the leaves, and re-roasting, which was done often, was something that tea merchants would routinely do themselves in order to refresh a stock of leaves — reigniting (and changing) the aromas of a tea, and to take out excess moisture that usually ends up imparting a sour flavour on the leaves.  Oolongs can go from virtually no roasting to really heavy, pitch black roasting, and the skill of the roaster in handling this again has a direct and immediate effect on the way the teas come out.  There is also a regional preference here, with Wuyi teas generally being of higher roast, for example, and modern day tieguanyin from the mainland are increasingly little to no roast — nuclear green, in other words, which I personally find terrible to drink. There’s literally something for everyone here, depending on one’s likes and dislikes.

Then there’s the question of aging, which I have written plenty about before.  I don’t think all oolongs will age well — only a select few do.  Badly aged oolongs are usually sour and pretty disgusting, and sometimes re-roasting them will fix the problem.  However, there are lots of fake aged oolongs out there that are simply heavily roasted teas pretending to be aged teas.  They can be nice, but they’re not necessarily very old.  I personally find aged teas to be most fascinating, and since I don’t drink nearly as fast as I buy tea, I end up having some teas that I age myself without really having intended to do so — such as the cup of 2006 Beidou that I’m drinking right now.  Over time, a properly aged oolong should have a reddish appearance in both the leaves and especially the liquor, and the taste should be sweet and aromatic.  Then they eventually acquire the type of taste that all aged teas get — hard to explain, but you know one when you see one.

The interesting thing here is that the permutations of various factors – location, processing, aging – combine to form all types of flavours and aromas that you can get from oolongs.  I can safely say that almost no two oolongs are the same, and every time I go to a store in China that specialize in some type of oolong or another, each batch that I try are going to be different in some way or another.  Because so much of it also depends on post-processing and storage, even after the same batch of tea left the factory, the ultimate result in your cup may still differ.  I suppose that’s what makes it fun.

Of all the families of teas out there, oolongs are probably by far the most versatile and varied in appearance, aroma, and taste.  Situated between green and black, oolongs, by definition, are semi-oxidized teas that can be almost as green as green teas (very light baozhongs come to mind) or very dark, almost black tea like (oriental beauty).  By virtue of the variations possible, oolongs are complex and interesting teas that often bear little resemblance to each other, but offer the drinkers a wide range of possibilities.  Making sense of all this can be difficult; I’m going to try to at least systematically lay out what these various issues are, and what I have learned so far.

There are I think three different factors that go into the growth of oolongs that we, as consumers, need to consider.  Those are, in no particular order, terroir, varietal, and season.  Then, in the processing from raw leaf to the finish product, there are additional variables that a tea farmer/maker can manipulate to change how the tea comes out, and those variables can include oxidation, rolling, roasting, and in some cases, aging.  I’m going to just try to talk about the first set of things and worry about the second set later.

When dealing with terroir, to borrow a wine term, we are really talking about the soil, climate, and other environmental factors that go into the growth of the tea, which in this case would also include altitude.  I think we can talk roughly about large geographic areas, but also small microclimates.  For example, teas from Taiwan tend to share a similar set of taste profiles, especially in the aftertaste of the tea.  They could be from different varietals, using different techniques, and grown in different areas of Taiwan, but many Taiwanese teas end up tasting similar in some fashion, and are often easily identifiable as Taiwanese.  Likewise, Wuyi yancha can (and to many, should) have a similar taste, especially that fabled yanyun, which roughly translates into “rock aftertaste”.  Even when Taiwanese tea farmers make teas using Wuyi varietal and methods, they can’t achieve the same results.  That’s terroir for you.

Location matters though, so whether or not the tea you’re having is from a hilly slope or flat ground, high up or down low, moist or dry, well lit or not, and shaded or otherwise all have to do with how the tea comes out in the end.  So while we can talk about large swathes of land when discussing tea, we can also talk about smaller areas.  Anxi tieguanyin costs more than teas from nearby counties, and not all Dongding teas are created equal, as anyone who’s tried a number of them can tell you.  Things like that are hard to control, and often for the end buyer, relatively meaningless, because we rarely know exactly which farm a particular tea came from.  When we can find out, however, it often tells you something about what you’re drinking, and accumulating experiences in telling apart various kinds of growing conditions is a true mark of a tea expert.

Varietals obviously also play a role here, and the most famous of these is perhaps tieguanyin and all its imitators.  A maoxie or huangjingui might look and taste somewhat like a tieguanyin, but it never is one, and those who drink a lot of tieguanyin can generally tell you right away if the stuff is real or not.  Likewise, we all know the story of the original dahongpao, and all the generations that the originals have spawned.  Varietal matters, and also changes the way the tea taste in a fundamental way.  Unlike terroir, for the consumer, varietal is difficult; it requires a great deal of experience to be able to tell apart different kinds of oolong trees and their leaves.  Whether that is a jinxuan or a siji or a ruanzi or a taicha #18, is not something that a tea novice can do easily.  If you don’t drink it often, chances are you are entirely at the mercy of the vendor, who is often at the mercy of the maker.  I think this is why finding reliable and trustworthy vendors is so important — not only that you can trust them to not lie to you, but you need to be able to rely on the vendors to do the due diligence and basically fact check the maker of the tea.  There are many out there who merely parrot the story told to them when they bought the tea — that’s sometimes a recipe for disaster.

The season in which the tea is picked is the final big variable for those of us trying to drink oolong.  A spring tea is inevitably different from a fall tea, and mostly on Taiwan, you often see a winter crop as well that is yet again different.  In my personal experience, spring teas tend to be floral while fall teas often have more body, and winter teas have a unique fragrance and sweetness that is quite distinctive.  You rarely see anyone advertising summer tea, and there’s a good reason for it — slower growing tea tend to be better tea, and summer is usually when the tree undergoes a growth spurt, leaving relatively thin and uninteresting leaves for you to consume.

Already, we’re dealing with a dizzying array of possibilities that can significantly impact the teas we drink.  Puerh-heads spend a lot of time worrying about these issues all the time — where the tea’s from, what season it’s picked in, etc, but oolong drinkers tend to obsess a little less about these.  I think a big reason for this is simple: the lack of clear and obvious ways to tell different sorts of teas apart, and the importance of post-processing that creates the final tea.  Those are serious mitigating factors to everything I’ve just talked about, and can change the tea in drastic ways.  Not having an easy way to tell apart different kinds of teas sold under different names is obviously a difficult issue as well.  Just witness the number of teas out there that are advertised as tieguanyin or dahongpao — surely, they can’t be making that much of these teas.  Something obviously has to give, which means that there is a fair amount of false advertising out there.  Since it is virtually impossible for the regular consumer to compare two of the same sorts of teas from two vendors easily, it is all the more important to at least educate ourselves with regards to what may be out there, and in doing so, become a more discerning drinker.

To be continued…