Actually I didn't really "choose". It was all pushed to me by seller saying they are god damn good. Paid $55 for 3 durians but wasn't the best pick at all! Feeling frustrated so wanted to do some homework tonight.
Saw this video I thought it's quite a good start.
ieatishootipost blogs Singapore's best food: The Durian Tutorial: Made Possible with my Creative Vado
I feel you buddy. Tuition money paid now is not really necessary but I think well worth for the long term.
First thing u wanna do is boycott this seller
Yup the video is really good but few things to point out and add on:
1) Never ever ever ever ever smell the "backside" like what Ah Loon did. There wont be any smell or it wouldnt be a good indicator of what's inside at all. Smell where you may ask? Smell the upper half and smell all round to have a perfect idea. Why smell upper half? Simply because durian ripen from bottom up. That is why those who know how to eat durian, will always take the flesh pod nearer to the stem as that is the most intense pod. And why smell round? Simple, to ensure you have a good and consistent durian.
Well anyway I think Ah Loon just wants to illustrate the essence of choosing a durian. I think he really did a good job in explaining how to choose durian in under 4mins. I would probably take more than that.
2) Odd shape and Round shape durian.
Like what Ah Loon was saying, the round shape is lower grade. Hmmm I think what he meant was the quality, as shown when he opened the durians. Choosing durians, we always want quality and for that we always try to choose odd shape durians. For reasons such as thicker flesh (quality) on each seed because there is lesser seeds (quantity). With rounder shape durians, you will get lots of seeds (quantity) but each seed is enveloped with so little flesh (quality).
3) Weight of durian.
Using your sense of touch and sight, you carry a durian by the stem and its size is of maybe a mature thai green coconut. Boy oh boy it feels so heavy for its size. Why is this so? Answer: Under ripe or more possibly over ripe. Why over ripe? Because it is full of water, you will get really wet flesh. How to confirm? Using your sense of smell, if the smell is over-powering and WOAH! then you can confirm it is over-ripe. If no smell at all? Under ripe and so you do a test by shaking it, no sound? Yeap, confirm under ripe because the seeds are sticking to the shell already.
So in a nutshell for point 3, what you want is a durian that feels and looks its weight. It should feel light and just nice.
4) Thorns.
I don't like to choose durians with many many many small tiny thorns. I avoid these durians because either the quality is really bad or the seeds are big. Big and wide thorns is the way to go for me. This applies when I am choosing kampong durians. Or if I see a branded cultivar i.e green bamboo, mao shan wang, d13 or d24. I will definitely go for it. Other cultivars like golden phoenix, red prawn, 101 etc. Hmmm very very rare or rather I have never seen before having such characteristics of wide and big thorns.
Next, as this section is on the thorns, we ought to give the durian of our choice a visual run down. Meaning do a detailed visual check on the entire durian's exterior. You don't want to have a durian with worm holes and get a surprise later. Press 2 thorns together and make sure it is firm and resistant. Just like Ah Loon had pointed out in the video, for the overnight durian which has released too much water. The thorns tend to be soft when pressed together.
Last but not least, check the "backside" of the durian. If it has opened or u notice the seams or "backside" is opening or opened. Put it back.
To conclude in step by step (not in sequence, but you may follow for simplicity sake):
1) Use your eyes to spot odd shape, freshness of stem (make sure its hard and as white as possible for the tip. Not brown, dry and shrivelled), any worm holes and "backside" is not opened. And the overrall durian should "shine" like how Ah Loon had pointed out. If its too "shiny", chances are its still very green and underripe. But you won't get this outside usually, this experience of mine is from my picking in the jungles of Singapore.
2) Use your nose to smell the upper section of the durian all around. You want to have a smell that is not over-powering or comes to you straightaway. You want a smell that comes to you slowly.... slowly... but surely. But seriously, try not to smell too much due to the pesticides used on them. I know of sellers that retire their business here and head back to their hometowns because they contracted nose cancer.
3) Use your ears to hear a knocking hollow sound as you shake it. Don't shake too hard for you might just smash the flesh inside. You see sellers knocking the durian with their knives? And you have experienced doctors tapping your stomach to check for stomach wind right? And and you have experienced choosing watermelons by tapping it for that beautiful hollow sound right? Same logic here applies, you want a durian that resonates a hollow "Pong Pong" sound. If you hear a "Ping Ping", it means underripe or the durian is wet on the inside.
4) Use your eyes and hand to pick up the durian and check if it looks like and feels like its weight and size.
5) Use your fingers to feel the hardness of the stem and resistance of the thorns.
Good luck and enjoy!