Udon and soba: two noodles, two temperaments, and how to serve them properly at home
Ramen gets the attention abroad. Inside Japan, udon and soba are the noodles people actually eat on an ordinary Tuesday, at a standing counter in a station, in three minutes, for the price of a coffee. They are older than ramen by centuries, they are regional in ways that start arguments, and they need almost nothing in the way of equipment. Here is the difference between them, where each one comes from, and what you need on the table.
The short version
| Udon | Soba | |
|---|---|---|
| Made from | Wheat flour, salt, water | Buckwheat flour, usually cut with wheat |
| Colour | White | Grey brown to almost black |
| Thickness | Thick, 2 to 4 millimetres | Thin, around 1.5 millimetres |
| Texture | Soft, chewy, springy | Firmer, with a slight grain |
| Flavour | Neutral, carries the broth | Nutty, distinctly its own |
| Eaten | Mostly hot | Hot and cold in equal measure |
The practical consequence: udon is a vehicle, soba is an ingredient. A weak broth ruins udon. A strong broth buries soba.
Soba, and the buckwheat question
Buckwheat has no gluten, so pure buckwheat noodles fall apart. Most soba is therefore cut with wheat flour, and the ratio is stated openly:
- Ni-hachi, two-eight: 20 percent wheat, 80 percent buckwheat. The classic ratio and the one most good shops use.
- Juwari: 100 percent buckwheat. Fragile, short, intensely flavoured, and the mark of a specialist. It also goes stale within hours, which is why juwari shops often sell out and close early.
Cheap supermarket soba can be mostly wheat with enough buckwheat for colour. Check the ingredient order on the packet: whichever flour is listed first is the majority.
Soba yu, the part foreigners miss
When you eat cold soba at a proper shop, at the end of the meal the staff bring a small pot of cloudy water. That is soba yu, the water the noodles were boiled in, thick with buckwheat starch and nutrients. You pour it into your remaining dipping sauce and drink it as a broth. It is not optional in the sense of being unusual, it is simply what is done, and it is one of the pleasant surprises of a soba meal.
Udon, and the regional fight
Udon varies more by region than almost any Japanese food, and every region is convinced of its own version.
- Sanuki udon (Kagawa): the famous one. Square-edged, very firm, springy enough to be almost chewy. Kagawa is a small prefecture with hundreds of udon shops and treats it as a civic identity.
- Inaniwa udon (Akita): thin, flat, hand-stretched, smooth. The refined one, often eaten cold.
- Ise udon (Mie): extremely soft, served with barely any broth, just a dark concentrated sauce stirred through.
- Fukuoka udon: soft. Deliberately, proudly soft.
An honest local note on Fukuoka udon
This is the part we can speak to first-hand, because it is the udon we eat. Visitors who arrive in Fukuoka expecting Sanuki-style bite are usually confused by their first bowl, and sometimes disappointed. Hakata udon is soft, almost yielding, and that is the intention rather than a failure of cooking.
The local explanation is historical. Hakata was a merchant port, and the theory told here is that a fast-moving trading city wanted noodles that could be served the moment they were ordered and eaten quickly, which means soft. Whether that is strictly true or a good story, the preference is real and it is defended vigorously. The classic Hakata toppings are gobo ten, a flat fritter of burdock root, and maru ten, a round fish cake. A first-time visitor should order gobo ten udon and accept the texture on its own terms.
There is also a plaque at Jotenji temple in Hakata claiming this is where udon and soba entered Japan, brought back from China by the monk Shoichi Kokushi in the thirteenth century. Historians are not unanimous. The temple is, understandably, quite firm about it.
The dishes you will see on a menu
Cold
- Zaru soba: cold noodles on a bamboo drainer, with a dipping sauce on the side. The purest form and the best way to judge the noodle itself.
- Mori soba: the same without the strip of nori on top.
- Bukkake udon: cold noodles with concentrated broth poured straight over, plus grated ginger and spring onion.
Hot
- Kake: noodles in hot broth, nothing added. The baseline, and the honest test of a shop.
- Tempura udon or soba: with a prawn or vegetable fritter on top, added at the last second so it stays crisp for about thirty seconds. Our tempura guide covers the batter.
- Kitsune: topped with sweet simmered fried tofu. Named after the fox, which folklore says is fond of it.
- Tanuki: topped with crisp fragments of fried tempura batter. Which of kitsune and tanuki means what changes between Tokyo and Osaka, and locals will correct you either way.
- Toshikoshi soba: eaten on New Year's Eve. The long noodle stands for a long life and the easy break stands for cutting off the year's misfortunes.
The broth, which is the whole thing
Japanese noodle broth starts from dashi: kombu seaweed and dried bonito flakes, sometimes dried shiitake or sardine. Dashi plus soy sauce plus mirin gives you tsuyu, used thin as a hot broth and thick as a cold dipping sauce.
The east and west of Japan diverge here, visibly. Kanto uses dark soy sauce and bonito-heavy dashi, giving a broth that is almost black. Kansai and Kyushu use light soy sauce and more kombu, giving a broth that is pale gold. Same dish, two colours, and people who move between the regions notice immediately. If you want to build dashi properly, our dashi essentials collection has the kombu and bonito.
Cooking them at home
Three rules cover most of it.
Use a large pot. Far more water than looks necessary. Both noodles shed starch and a crowded pot turns gluey.
No salt in the water. Unlike Italian pasta, the noodles already contain salt, and adding more changes the texture. This is the single most common mistake.
Rinse under cold running water. Always, hot or cold service, and rub the noodles gently with your hands while you do it. This stops the cooking and washes off the surface starch, and it is what gives the noodles their clean surface. For a hot dish, dip them back into hot water for a couple of seconds to reheat before they go in the bowl. Skipping the rinse is the difference between noodles that taste like a shop and noodles that taste like a packet.
Dried noodles take six to nine minutes for soba, eight to twelve for udon. Frozen udon, widely sold outside Japan, takes about a minute and is genuinely better than dried for texture. Taste one before you drain.
What goes on the table
Noodles need less equipment than almost any other Japanese dish, but the shapes matter.
- A deep bowl for hot service, wide enough that the noodles are not compressed and deep enough to hold broth. The ramen bowls work equally well for udon and soba.
- A flat drainer or basket for cold soba, so the noodles do not sit in their own water.
- A small cup for the dipping sauce, held in the hand rather than left on the table.
- Chopsticks with a slightly rough or tapered tip, because smooth lacquered tips and wet noodles are a poor combination. Our chopsticks and rests cover this.
- Condiments on the side: grated daikon, spring onion, wasabi for soba, shichimi pepper for udon.
Everything you need for the dish itself is in our udon and soba essentials.
And yes, you slurp
It aerates the noodle and cools it on the way in, and in a soba shop the sound is taken as a compliment. Nobody is going to mind if you do not, but this is the one case where the etiquette rule everyone has heard about is entirely real.
