Sanuki Udon and Beyond: Why Kagawa Is Japan's Noodle Heartland

On the island of Shikoku there is a prefecture so devoted to a single noodle that its tourism office once rebranded it as Udon Prefecture. Kagawa, Japan's smallest prefecture by area, is home to hundreds of udon shops (tourism sources count more than 600), from tiny family counters in farming towns to busy places beside train stations, and locals will happily plan a day around a bowl of Sanuki udon.

Udon (thick wheat noodles) is eaten all over Japan, yet it changes character from region to region. This guide explains what makes Sanuki udon special, how the noodles are made, the difference between kake and zaru, how other regions interpret the dish, and how to plan a noodle journey of your own.

What Makes Sanuki Udon Special

Sanuki is the old name for the area now called Kagawa Prefecture, and Sanuki udon is the noodle that carries that name. It has a square cross-section with flat edges, and its great pride is koshi, a Japanese word for the firm, springy, chewy resistance of the noodle when you bite it. A good Sanuki noodle is glossy, a little elastic and clean-tasting, neither mushy nor hard.

The recipe could hardly be simpler: wheat flour, salt and water. The craft lies in the proportions and the handling. The dough is kneaded, rested, rolled and cut, then boiled for only a short time and served at once. Many shops make their noodles by hand or in view of customers, which adds to the pleasure of eating there, and the packaged products sold across Japan under the name follow labeling standards that call for a minimum amount of salt and a rest period for the dough.

How the Noodles Are Made

Traditional udon makers describe a process built on feel. Flour, salt water and patience are combined into a stiff dough. Then comes the unusual part: the dough is placed inside a plastic cover or cloth and trodden on with bare feet, sometimes for up to an hour, to develop the gluten that gives the noodle its bounce. Visitors can try this themselves in hands-on classes offered at several udon schools in Kagawa.

After kneading the dough rests so the gluten relaxes, and then it is rolled into a sheet, folded and cut into wide ribbons. The noodles are boiled in a large pot of water for a matter of minutes, rinsed, and served hot or cold. The broth is usually built from iriko (dried baby sardines), sometimes with kombu (kelp) or katsuobushi (dried bonito), and seasoned with salt and soy sauce. The result is gentle, savory and slightly smoky, designed not to overpower the noodle.

Kake, Zaru and Other Ways to Serve Udon

Two words cover most menus. Kake udon is the classic: hot noodles in a light broth, usually topped with chopped scallions and sometimes a slice of kamaboko (fish cake). In Kagawa the plain version may simply be called kake. Zaru udon is the cold counterpart, noodles served on a bamboo tray with a stronger chilled dipping sauce, often with grated ginger, wasabi or shredded nori (seaweed) on the side.

Kagawa has a few other beloved styles. Kamaage udon arrives in the hot water it was boiled in, to be dipped in a sauce. Kamatama combines hot noodles with raw egg and a splash of soy sauce, which sets into a silky coating. Bukkake udon is topped with a concentrated sauce, either hot or cold. Shoyu udon, dressed with soy sauce, grated daikon radish and citrus, shows off the noodle itself. Tempura, whether vegetable, shrimp or fish cake, is a popular topping, and rice balls and oden often sit on the counter as sides.

Udon Across Japan

Outside Kagawa, udon takes on many forms. Inaniwa udon from Akita Prefecture is a thin style, dried in the Akita tradition and often enjoyed cold. Kishimen from Nagoya is flat with wavy edges. Hoto from Yamanashi Prefecture is a wide, flat noodle simmered in miso soup with vegetables, especially pumpkin, and its dough is made without salt. Goto udon from Nagasaki Prefecture is stretched by hand and traditionally coated with camellia oil to keep it from drying out.

Regional broths differ too. Kansai tends toward a light, golden dashi seasoned with pale usukuchi soy sauce, while Tokyo and the Kanto region lean toward a darker, saltier soy broth. In Osaka, kitsune udon topped with sweet fried tofu is a local favorite. Each style reflects the local grain, the local soy sauce and the local taste for strong or delicate seasoning.

A Short History of the Noodle

How udon arrived in Japan is debated. One popular story credits the Buddhist monk Kukai (774 to 835), also called Kobo Daishi, who traveled to China and is said to have brought back noodle-making knowledge. Kukai is closely linked with Kagawa, where he was born, and with Manno-ike, a huge reservoir he is said to have helped restore in 821 that irrigated farmland where wheat could grow. The tale is a legend rather than a documented fact, but it speaks to the way the region's identity is tied to noodles.

By the Edo period (1603 to 1868), thick wheat noodles served in hot broth were generally called udon, while thinner chilled noodles were known as hiyamugi. Over time udon spread from temple kitchens and festival tables to street stalls and everyday restaurants, and a regional specialty became a national comfort food.

Udon Culture in Kagawa

Part of what visitors enjoy is the casual style. Many shops in Kagawa are self-service: you pick up a tray, ask for a ball of noodles in a hot or cold bowl, add tempura or an egg from the counter, ladle on broth and pay at the end. Some famous places are tucked away in ordinary houses and open early in the morning for workers and locals. Others sell out of noodles by early afternoon, so arriving at lunchtime is wise.

Slurping is perfectly normal and even encouraged, since it cools hot noodles and carries aroma. Locals often visit several shops in one day, ordering only a small bowl at each. The prefecture's tourism association actively promotes this noodle crawl, and its 2011 campaign officially gave Kagawa the nickname Udon Prefecture.

Plan Your Noodle Trip

Kagawa is reached by rail from Okayama over the Seto-Ohashi Bridge, and the main city, Takamatsu, is about four and a half hours from Tokyo and two and a half hours from central Osaka by train, according to Japan's national tourism organization. Takamatsu also has an airport and ferries to Naoshima and other art islands. Ritsurin Garden, completed in 1745, is a perfect place for a walk between meals.

Many shops are small, close on certain days and may have limited hours, so check opening times online or ask your hotel before you set out. Bring cash in case a shop does not accept cards, order a small portion if you plan to visit several places, and finish your broth only if you wish. Say gochisosama deshita (thank you for the meal) when you leave, and enjoy a noodle culture as friendly as it is delicious.