Showing posts with label temperature. Show all posts
Showing posts with label temperature. Show all posts

Friday, September 14, 2012

My Theory- Tea and Mountains and Temperature

I really need to go on top of a mountain and make some tea. Why? Because I was looking at mountain pictures or something the other day when I noticed that the climber remarked that while he was going to make a cup of tea on top of the mountain, he didn't expect it to be any good because the altitude was too high to reach 212 F (boiling temp at sea level).

Here's how boiling temperature and altitude go:

Altitude (ft/m)- Boiling Temperature (F/C)
  •  0/0- 212.0/100.0
  • 250/76- 211.5/99.7 (This is about where I go to college)
  • 500/152- 211.0/99.5 (This is about where I live when on the west coast)
  • 1000/305- 210.1/98.5
  • 2000/610- 208.1/97.8
  • 3000/914- 206.2/96.8
  • 4000/1219- 204.3/95.7 (One of the lower elevations of good quality tea)
  • 5000/1524- 202.4/94.7
  • 6000/1829- 200.6/93.6
  • 7000/2134- 198.7/92.6
  • 8000/2438- 196.9/91.6 (Pretty much the highest elevation of tea I've seen online)
  • 9000/2743- 195.0/90.6
  • 10000/3048- 193.2/89.6
As you can see, tea isn't even really grown at an altitude that has a boiling temperature of anything lower than 205/96. Higher quality tea from higher altitudes are grown at places where the boiling temperature of water is even lower, far below 200/93!

So why are we trying to boil our tea at 212/100?

I will tell you from personal experience, tea can brew at basically any temperature, especially green and white tea (I haven't tried it with a yellow, but I suspect yellow would be the same, as with less oxidized oolongs). In an older post, you will notice me brewing Japanese gyokuro with snow. I have yet to record these differences well, but the taste of the tea will change markedly about every 10/6 degrees.

You may be saying, "Well that sounds fine and all for the less oxidized and fermented teas, but the darker teas still need really hot water." and I will disagree with you. They grow black tea at those high altitudes too, you know. Very good pu-erhs come from some very high altitudes. Also, I've always suspected that the reason why I hated red tea (black to all of you Westerners who are new here) was because it was being brewed at too hot of temperatures like is commonly done to all other teas. Sometimes I've also noticed that I really dislike my pu-erhs if they're brewed with boiling water, but I like them better at around 195. So that's where I brew my tea at the maximum.

Here is my tea temp range (F):
White: 1-120
Green: 1-120
Lightly oxidized oolongs: 120-160
Dark oxidized oolongs: 120-175
Red (back) tea: 160-195
Pu-erh (and other fermented teas): 185-195

And note, these are not set in stone and are personal preferences. Also, I don't have enough experience with black teas to really tell you that is my minimum temperature for sure. But I do have one that I've been drinking recently that I like (lychee flavored is why hahaha) and I've liked it at 195.

Why are the ranges so high (especially for whites and greens)? Depends on my mood. Some days I want to be hit in the face by my tea's massive flavor (lower temp) and some days I want a more mellow ride and a hot cup in my hand (higher temp).

Note that the amount of L-theanine and caffeine will change depending on the temperature you brew your tea at. More caffeine is released at higher temperatures, contributing to the mistaken theory that darker teas have higher levels of caffeine. L-theanine is more present in tea brewed at lower temperatures, contributing to the noted relaxing effect and false idea that there is less caffeine in the lighter colored teas (L-theanine counters the stimulatory effect of caffeine). Also note that while L-theanine is noted to be in higher concentration in more white and green teas, it is not absent from the others. I haven't figured the exact specifications of that entirely yet, but I'm getting closer. Ask me if you want my sources for anything, I suppose I should just put up a post and update said post with all my sources anyways.

So in conclusion: drink tea at lower temperatures!

Friday, August 17, 2012

Passed 500 views! And how to fill a cup.

Congratulations College Tea Time blog readers! We have managed to pass 500 views! As much as that makes me happy, I don't really think it means too much important though, especially since I still only have 8 comments, and I think at least 3 of those are mine. Hahaha. So I'll cheer a lot more when the number of comments goes up.

On this unfortunately hot summer night I'm drinking more pu-erh like usual, listening to enya, and enjoying frozen fruit popsicles while reading. It inspired me to write another haiku. So here I am, forcing my silly and poor haiku skills on you.

Frozen fruit and tea,
On a hot summer evening,
Makes a happy me.

 

In addition to this, I've been thinking a lot about the best way to fill up a tea cup. Quick note, I don't think this actually affects the way the tea tastes. Hahaha. But it's certainly important for a few things things.

First off, not burning your or your guest's hands/fingers/mouth.
Being that I value my cups and brewing vessels more than my skin (skin repairs by itself for free, but broken teapots/cups/gaiwans do not and cost money), I suffer finger burns quite regularly. It hurts. Only once it's gotten to the point where a blister formed, but I've had to put on burn cream quite a few times anyways, and did I mention it HURTS??? Hahaha. So I've done some troubleshooting. Normally, as an American I think, I love a full cup. When I worked at Teavana, I noticed customers always acted like the shop and I was being really stingy by only filling the little sample cups 1/2 full. 

Dear sweet customers, the tea is VERY HOT and those iddy bitty paper sample cups are not heat resistant at all. There may be a bit of stinginess involved since it takes a long time to make enough tea to fill those things once they're empty and that's especially troublesome when there are a lot of customers, but really we were hoping that you'd be able to taste the tea in a timely fashion and without causing you physical pain. It's not a conspiracy to steal food and drink from you.

If you think about it, there are three causes of this problem and more or less three solutions to keep in mind when pouring tea for either yourself or guests.

You could brew the tea at a lower temperature and just save yourself a lot of trouble. For green and white teas, this is pretty much my solution. Although that's also because I just plain like the taste of those teas better when I brew them in cold or lukewarm water. 

But for herbal tisanes or oxidized teas such as oolongs, blacks, and pu-erhs though, that's really not the way to go. I suppose you could cool the tea down after you make it, but you've got problems with that too. Tea really does just plain taste better fresh. I am not a bottled tea fan, no matter the brand (out of any I'd probably trust Tao of Tea the best, though I noticed that Smith's has released a line of bottled teas too), because I'm pretty sure the longer the tea is in water the more it keeps doing. I don't know all that it does, but it does something. Hahaha. It's most noticeable with green teas where if you brew it at a higher temperature and then don't drink it quickly the tea will (if originally green in color) turn more yellow usually. I'm pretty sure this is the reason why I have never seen bottled green tea that is actually green unless they put coloring in it. But this is also the reason why I don't suggest putting the tea in the fridge. I will do that every once in a while just because I hate wasting tea if I don't have time to drink all that I made, but like I said, it's not my favorite thing to do. 

Putting in ice is also not my choice because then when the ice melts (which the first few cubes will very quickly) you will be diluting the tea. Some people like to dilute their drinks, but cranberry and grape juice is the only thing I'll do that too. Would you dilute your coffee with water? 

Of course, that brings up putting in milk, which I find a fairly acceptable idea for teas with spices or flowers or just plain black tea. I've never done that to an oolong though and I haven't had enough pu-erh that I wanted to waste to try it out with pu-erh except for one time when I was particularly tired which put me into a super childish "let's mix everything!!!" kind of mood. It did taste good though. And it turned out pink which was really weird. But anyways. That's a topic for another day's post.

If you were absolutely desperate to maintain your tea's flavor and cool it down quickly, I think I'd vote for freezing large glass marbles and using them like ice cubes. The glass won't interfere with the flavor at all unlike unglazed ceramic balls (commonly used to clean water and I've heard it improves tea's flavor, but that's still changing it), rocks, or plastic ice cubes (my fear would be that the heat of the tea would release BPA from the plastic into your drink, and plastic is weird in many other ways). If figure large glass marbles aren't particularly hard to find, and I'd think they'd take the change in heat pretty well which is something I'd worry more about with freezing the cup and then pouring hot tea into the cup. (I like my tea cups a lot)

Which brings me to different cup types! There's really more in choosing a tea cup than you'd imagine. You don't just want to find a pretty one or one with a texture you like in your hands and on your lips or a color to enhance your tea's color, but you also want to consider how big the cup is, the shape, and how thick the walls of it are.

You wouldn't believe the debate about which type of cup holds heat better. Thin vs. thick walled cups. I've heard that many people find that bone china (very thin walls, lovely stuff) keeps the heat in well, but I know that in Japan, winter cups are very thick. I haven't taken any thermodynamics yet so I don't trust any theories I have enough to tell you what I think. Maybe I'll test it out here soon. My mother has a huge (and gorgeous) European tea cup collection which will provide me with cups of much thinner walls. (But yet she drinks instant LIPTON. You have no idea how much it murders me when I see her doing that. It's not like she even uses a bag for crying out loud. IT'S INSTANT. *shudders*)

In some countries, tea cups have lids. I think this mostly goes for Asian ones. Almost all the infuser mugs you find from China have lids, and fancy cups for guests in Japan have lids. The idea in Japan at least is if your tea is hotter for longer, your guest will feel more welcome and stay longer.

Then of course, how much you put in the cup probably makes the most and easiest difference. If you fill up a cup all the way, it will take longer to cool down (and to drink, even those little tiny cups can manage two drinks if you fill them up too much) than if you don't. Furthermore, the tea will also heat up the cup. The advantage of European style cups is definitely their handles. Especially initially, the cup will heat up to only slightly less than that of the tea to where the tea level is inside. So if you pour in the tea to the top, the cup is also going to be hot all the way to the top. This makes it hard to hold the cup without burning your fingers when you're trying to pass the cup or just pick it up to take a sip.

If you cannot hold your cup properly, you're also likely going to spill.
Which means wasted tea, a mess, and probably burned fingers as well. 

Not filling up the cup all the way is an easy fix to this, but not a perfect one. People are still going to spill tea and be clumsy. But still, better something than nothing. It's really not like it hurts anyone to force them to have to refill their cups if they want more. Honestly. I could completely rant here about over-sized USA and that NYC law, but I'll just leave it at that. Hahaha.

When your cup is filled too high it takes more times of drinking to empty it, changing the heat between each drink, making each taste colder than the last till finally you're probably like me and throwing your last half of your cup back in to your pot (I don't do this when I drink with people!) because you want at least warm tea.
Drinks and food taste different at different temperatures. Surely you've noticed that you hate cold mashed potatoes (or something), that ice cream tastes terrible when warm, or that Europeans generally think US beer tastes weak and disgusting because they drink theirs warm (sometimes I hear differently, but I really couldn't say since I don't drink beer)? Heat brings out more flavor. You want your tea to be at its best brewed temperature. But of course you want to drink it. Solution? Just don't pour in as much. Then you get to keep the majority of your tea in the pot where it'll stay hotter for longer than it would in your cup.

What's that? All of those problems had a common solution?
Just don't fill the cup up all the way. :) Ta-dah!

Saturday, June 9, 2012

Coffee Floats and Tea Sinks? Where To Put Your Leaves?

"Coffee Floats and Tea Sinks" is apparently the title of some book, but it was a book about coffee, so I didn't bother looking at it much more than that on amazon.

Today, kind of like usual, I was looking around online for a nice Gongfu tea tray. Upon looking around, I found out that some people call it a "tea sink"! I started looking for one using those keywords, but came across something interesting about tea leaves sinking into the water instead.

Vicony Teas Tea Encyclopedia How to Brew Tea

I'd never heard of this before, but apparently there are 3 different methods of brewing tea concerning when you put the leaves in the water. Most of us use "Bottom-Putting Method" (下投法), but it appears that for green teas we should be either using "Middle-Putting Method" (中投法) or "Top-Putting Method" (上投法). What is the difference between these 3 methods? Well simply put, it has to do with where you put the leaves in the water.

For those of you who don't know, this can be important to consider because some leaf flavors are more sensitive to heat than other. My favorite tea, Gyokuro (a Japanese green) is a perfect example for what the different temperatures of water do to the flavors. Green tea in general likes water at about 175 F. Personally, I never like my greens at anything higher than 160F (unless it's Houjicha). When the water is too hot, it brings out a very disgusting bitter taste in green tea. When the water temperature is correct, you will taste sweeter, grassier, more flowery and vegetal flavors instead (unless your tea is either crap or too old). About every 5-10 degrees between 35F and 140F (the highest I'll ever go with Gyokuro), you will notice a difference in the flavor of Gyokuro. Why? Because different chemical components of the leaf are being pulled out (lower temperature= more L-theanine, less caffeine) and the temperature also highlights different flavors too. Ever notice how American beer tastes like crap at room temperature, but the Germans think we're insane for drinking beer cold? Or how ice cream is way too sweet when warm?

As I tried to imply with Bottom-Putting Method (henceforth BPM), this is where you put the leaves in before putting the water on top. This is what most Americans use, probably because we're so used to doing dry ingredients before wet ones when baking. You're really never supposed to do this with green tea because that's too harsh on the delicately steamed leaves (or pan fried if they're Chinese). This source seems to suggest that you shouldn't really do that with any type of good quality tea, but I guess I'll have to do an experiment with that using pu-erh and oolong (I don't have any black teas) and see if there's any reason to fuss about that with the hardier, more oxidized teas.

Middle-Putting Method (MPM), seems pretty interesting to me. In this method, the source says to fill the brewing container about 1/4th of the way with water at brewing temperature. Then you need to put the leaves on top of that and let them soak a little until they start to float down (vessel may be shaken slightly). Finally you fill the rest of the vessel with brewing water and then wait until the leaves fall to the bottom (it suggests that if they don't then your water is too cool, but that appears to be partially because it looks like they're suggesting drinking "Grandpa style") and then wait for it to brew (about a min or so) and only then drink. This is suggested for Chinese greens like Longjing (Dragon Well) and Huang Shan Mao Feng (Yellow Mountain Fur Peak) with are both delicious.

Top-Putting Method (TPM) is where you put the leaves on top of the brewing water. They recommend this for even more delicate teas like white teas apparently (they say Bi Luo Chun, but I haven't ever had this one or seen it before which isn't surprising because I'm not typically a white tea person).

I'm curious to see if these really do make an impact on flavor. For more delicate teas for sure, I would imagine that they do, but I'd like to try it out for myself too. If any of you have experience with this as well, or know anything more, please feel free to comment on this post!

On a more personal note, I'm down to my last 5 grams of my absolute favorite 2898!!!!!!!!!!! Oh my goodness. When you get a new brick, it looks like it'll last you forever, but I'm down to the last tippy little corner now, and in another 2 hours or so it'll be gone. I'll possibly post something in it's memory. Hahaha. But funnily enough, getting a larger gaiwan and hand strainer has really increased my tea consumption. I had nearly 50 grams still left a month ago when I came back to Seattle from Mount Holyoke. Hahaha. Oh well. I've loved every drop of it!