Basics: Cold soba noodles with dipping sauce
Most of Japan gets very hot and humid in the summer. To combat the heat, a number of dishes meant to be eaten cold have been developed. One of the main cold summer dishes is cold noodles.
Soba noodles, made of soba (buckwheat), are available all year round but are really popular when the heat turns unbearable. As with other cold noodles, they are prepared in a way that may seem strange if you’re used to pasta and other Western-style noodles. Unlike pasta, most Japanese noodles, including soba, are rinsed rather vigorously in cold running water. This not only cools them down but gets rid of excess starch, which adversely affects the flavor of the noodles. Many recipes written in English omit this critical rinsing step: you don’t just plunge it in cold water, as many directions incorrectly state, but you actively wash the noodles. Once you’ve done this once, you will definitely notice the difference. I’ve given detailed instructions for this procedure below.
Dipped into a properly made sauce or soba tsuyu, with plenty of spicy condiments or yakumi, there’s nothing more refreshing to eat on a hot summer evening.
Cold soba noodles with dipping sauce (Zarusoba)
Note: zaru means basket - so these are soba served in a basket.
To serve 4 people
For the sauce (soba tsuyu):
- 1/2 cup of kaeshi
- 1 1/2 to 3 cups of dashi stock or vegetarian dashi stock
Combine the two in a pan and bring up to a simmer. The less dashi you add the more intense the sauce will be, so add the dashi a little at a time, and start tasting after you’ve added about 1 1/2 cups: keep adding if it’s too strong. Simmer for 2-3 minutes, then let cool. You can do this a day ahead of time, and refrigerate the tsuyu.
The noodles:
- 400g soba noodles, or about 100 grams per person (See note below about selecting soba noodles). Most soba comes in 100 or 200 gram packets.
Condiments, or yakumi:
Select at least one from:
- Finely chopped green onions (this for me is essential)
- Grated wasabi
- Seven-flavor pepper (nanami tohgarashi = see this list for a description)
- Toasted sesame seeds
- Finely shredded green shiso leaves (another favorite for me, if it’s available)
- Finely cut nori seaweed (cut with a pair of kitchen scissors, or just shred with your hands)
- Grated fresh ginger
- Finely julienned myouga (a kind of onion-like bulb: hard to find outside of Japan)
- Finely grated yuzu peel
Cooking the soba noodles
Bring a large pot of water up to a boil. Unlike Italian pasta, you do not need to salt the water. Once it’s boiling, hold the noodles over the water and sprinkle them in strand by strand.

Once all the noodles are in, stir gently so that they are all immersed in the water.

Bring the water back up to a gentle boil, then lower the heat so that the water is just simmering. (This differs from the ‘rolling boil’ that’s recommended for pasta.) If the water threatens to boil over, add about 1/2 cup of cold water (but if you lower the heat to the gentle simmer, and have a big enough pot, this shouldn’t be necessary). Cook for about 7 to 8 minutes, or following the package directions (for thinner noodles 5 to 6 minutes may be enough. Test by eating a strand - it should be cooked through, not al dente, but not mushy either).

Drain the noodles into a colander. Immediately return them to the pot and fill the pot with cold water. When you’re draining the hot water you may notice that it smells quite ‘floury’. This is what you want to get totally rid of.

If the noodles threaten to flood out over the pot, put the colander on the pot to hold the noodles down. Leave the water running for a while over the noodles.

Once the water and the noodle are cool, start to ‘wash’ the noodles. Take handfuls and gently swish and rub them in the water. Your goal is to wash off any trace of starchiness or gumminess on the noodles. When you’re done the water should run clear.

Make ready a flat sieve - a bamboo one is ideal and looks pretty. (You can use a nice looking colander instead, but flat sieves like this aren’t expensive - look in Asian markets.) Take a few strands of the noodles at a time.

Loop the strands onto the sieve to make a nice little bundle. This is one portion.

Allow for about 10-12 portions or so per person, if you’re using individual sieves. Arrange each bundle separately, to allow for easy pickup with chopsticks.

To serve the noodles: place a plate under the sieve or sieves to catch any drips. Put out small bowls filled with the condiments of your choice, which each diner can pick from. (Remember to put out small spoons and things if needed for the sesame seeds etc.)
The dipping containers can be anything that can hold about a cup or so of liquid. A rice bowl or a small soup bowl, or even a tumbler, can be used. Here I’ve used some small pudding molds that were a flea market find. (In Japan you can get special soba bowls or sobachoko.)

Fill each dipping bowl halfway with the cooled dipping sauce or soba tsuyu.
To eat, each person puts in the condiments of their choice, take a portion of the soba, and dips it in the sauce briefly - then, immediately eats the soba. Don’t let the noodle soak in the sauce or overload it with condiments, otherwise the delicate flavor of the soba will be overwhelmed.
Types of soba

The purest kind of soba noodle is made of 100% soba or buckwheat flour, plus water and salt. That’s really my favorite kind. There are other kinds of soba noodles though. Here I’ve used one made partly with konnyaku powder (which makes it quite sturdy, and supposedly lower-calorie).

Another popular kind of soba noodle has some green tea powder in it, which makes it a pleasant green in color. You don’t really taste the tea much though.
The best kind of soba noodle is freshly made (te-uchi), but this is a bit tricky…I haven’t actually mastered it yet. Maybe one day…
What to have with soba noodles
One of my favorite summer meals is cold soba, cold tofu or hiyayakko, some not-too-salty pickled cucumbers, and ice cold mugicha to drink. Another favorite soba accompaniment is tempura, which can be dipped in the same sauce - for some reason ika tempura (squid tempura) seems to fit particularly well. But tempura is a rather hot and sweaty thing to make, so I usually stick to the cold tofu.
And visit our new sister site Just Bento - all about bento!











Love cold soba!
Thanks for this post and the post on how to make kaeshi! I first had cold soba for breakfast on a flight from Tokyo to Honolulu many years ago, and it was a wonderful meal. I now keep soba noodles on hand just so that I can enjoy this dish.
This is so wonderful!
And how I wish I read this the first time I tried making zaru soba. The first time I made it was icky since I didn’t wash it. It was a good thing someone told me to do so next time which I did, otherwise, I would’ve set it aside as something to never eat again.
Yum!
Cold soba is my favorite dish of summer besides cold somen! I also must have green onions with mine. Sometimes I’ll slice a little komoboko (fish cake) to go on the side. My grandpa used to make us somen all the time. It’s a bit of a comfort food for me. Delicious!
Umasou da ne!
So simple, but also so delicious. Growing up, we used to only have zaru soba about once a year when soba was still hard to find, so it was a real treat.
Do you drink the tea? or whatever it is of the leftover men tsuyu mixed with some of the hot starchy cooking water afterwards? Maybe it was just to avoid wasting the tsuyu, but it is pretty good as long as you don’t have too much tsuyu.
drinking the tsuyu
Actually, I’ve always felt a bit guilty about drinking the tsuyu…my mother always said it was ‘bad for you’ since it was very salty. Still…it tastes delicious (and is rather diluted after the noodles are finished) so I usually finish it off :)
wonderfully in-depth
Thanks for this post - it’s wonderfully in-depth and has me searching my kitchen cabinets for soba noodles, kaeshi, and dashi!
Thank you so much for this
Thank you so much for this awesome recipe! I posted this as one of my favorite blog picks of the week! - http://www.godairyfree.org
Blast from the Past
Thank you! I’d totally forgotten about this dish. Have a major craving for it now and am unfortunately unable to find buckwheat noodles. Sigh.
Japanese food
Hi Maki!
I really love your blog, have known it for some years already. I miss Japanese food from Japan, restaurants in Spain tend to have just sushi, yakitori and a few more things and some of them don’t tast as good as in Japan, so I end up cooking them at home from time to time. So it end ups being boring and expensive to go to them. I miss kateiryouri restaurants, izakayas and gyudon specially. Today I just happened to make zaru soba and I came across your recipe just after eating mine. I handmade my tsuyu too and it was quite good. I’ll have to try yours!
By the way, Maki, I’m obsessed with Hayashi rice but cannot seem to find any recipe with 100% home-made ingredients. I don’t know if that’s possible or if you must buy ru or mix ketchup and weircester sauce instead. Do you know of any good recipe for hayashi rice?
hayashi rice
Hi Helena! Hayashi rice is something I have been meaning to post here for some time but I haven’t gotten around to it yet…and now that we finally have real summer here in Switzerland it doesn’t seem to fit the weather at the moment! Briefly though, hayashi rice is a beef stew (using demi glace or a rich beef stock) with added tomato (in the form of puree or ketchup or both), a bit of worcestershire sauce, bit of soy sauce. It also needs tons of sliced and sauteed onions, and the beef should be thinly sliced. And it’s thickened with a roux. Maybe that can get you going in the right direction?
soba tsuyy
How long will the tsuyu keep for in the fridge?
tsuyu
Tsuyu should keep for a couple of days in the fridge, but for long-term storage you’ll want to have the kaeshi and add the dashi to it (to make tsuyu). Kaeshi will last for quite a long time in the fridge. have
If you have tsuyu that’s been in the fridge for some time, bring it to a boil first before using it…but sniff it first; if it smells even a bit sour or ‘off’ then toss it.
A sushi bar my family orders
A sushi bar my family orders from often has recently added this to their menu, since it’s been getting so hot out lately (served as a “summer special” with inari nigiri), and I’m looking forward to trying it now after reading this!
Thank you for the recipe!
I just made this and the
I just made this and the agedashi tofu—it tasted SOOO good and my boyfriend agrees, too! I’m never ordering these items at a restaurant again!
Thank you for sharing your recipes!
Appreciation
I have been struggling with gummy 100% buckwheat soba for ages. Thank you so much!
Don't drain all the B vitamins!
Lots of the nutrients in soba are water soluble, so the water it is cooked in is high in B vitamins. I suggest collecting some of it (put a bowl under the colander) and keeping it aside. In a Japanese soba shop it is called Soba-yu - you can ask for it at the end of your meal and it is typically brought in a square red teapot. Add some (best if it7s still warm) to what is left of your dipping sauce and drink it like a soup (very nice!). Or you can add some to a miso soup.
Vegan Alternative
Whilst I love soba and enjoy it prepared just as in your recipe, I’d never found a satisfying vegan way to enjoy these noodles I could share with friends.
Hope you don’t mind me sharing this here. I came across a recipe for bibim-guksu in http://mykoreankitchen.com using Japanese style soba recently. It’s great as it is, but I modified it slightly and really enjoy this alternative way of enjoying cold soba.
Soba is cooked just as you suggest but it is tossed with the following sauce (mixed together - good for two servings of soba)
1 tbsp gochujang (Korean pepper paste)
1 tbsp miso
2 tbsp rice vinegar
1 tbsp soy sauce
1 tbsp honey
1 tbsp toasted sesame oil
and a few shredded salad ingredients
thanks for the recipe!
Thanks for posting the recipe Loretta! I love kochujan/gochujang. I agree about the soba-yu, though I reserve it only when it’s from freshly made noodles or a soba-gaki (sort of a leaf-shaped soba dumpling) usually.
where to find soba noodles
I’m just curious if you can find soba noodles just in a regular super market, or are they located and sold strictly in Japanese markets/stores? I looked today at the grocer but did not find them!
It really depends on where
It really depends on where you live. I have seen soba noodles sold at regular supermarkets in some parts of the US for example, and they are sold in the ‘gourmet’ section of department stores here. Otherwise health food stores sometimes carry them. But Japanese grocery stores usually have the best selection. Some Asian (as in East Asian/Chinese) stores carry them too, if they carry Japanese ingredients.
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