Yoshino kuzu

The name Yoshino kuzu points first to Nara's Yoshino region. Yoshino honkuzu is defined around kudzu-root starch made in the Yoshino area, or at least refined in Yoshino and its surrounding region. The living production map also reaches Uda and Gose, where the technique is still passed on; Uda matters because cold climate and suitable water help the repeated washing and settling that shape the starch. Yoshino gives the name and boundary, while Uda and Gose keep the winter-water work visible in the present.

The material boundary is narrow for Yoshino honkuzu: it uses starch taken from kudzu roots, with 100% kudzu starch marking the honkuzu line. Broader Yoshino kuzu uses kudzu starch as its main raw material but may contain other starches, which is why similar names can behave differently in sweets and cooking. Pure white honkuzu gives prepared foods a smooth mouthfeel, clear translucence, and a gentle gloss tied to both the root material and the refining process.

Kudzu is a perennial vine in the legume family, and winter is important because the plant stores starch in its roots. Suitable wild roots have traditionally been dug by skilled workers known as horiko, then carried into the first stages of crushing and washing. The yield is small: one account gives about 100 grams of white starch from one kilogram of root, while another places the yield at about 6% to 10%. Those figures make the labor behind a cup of kuzu-yu or a piece of kuzumochi easier to grasp: much root, cold work, and very little finished white starch.

After the roots are crushed, makers wash them, filter out the starch, let it settle, and dry it into rough kuzu. Yoshino-zarashi, also called kanzarashi, then repeats the slow sequence of dissolving the rough kuzu in cold water, stirring, waiting for sediment to settle, changing the water, and doing it again until impurities are removed. The winter refining can take about a month. Cold water and patient settling protect the starch granules, leading to the white color, smooth texture, and gloss valued in finished dishes.

Yoshino kuzu becomes visible in wagashi such as kuzumochi, kuzukiri, kuzu manju, and parts of yokan, and it also appears in kuzu-yu, sesame tofu, and cooking thickeners. With water and heat, the white starch turns translucent, smooth, and glossy; in kuzukiri it forms clear, elastic strips, while in sesame tofu it helps hold the richness of ground sesame. These uses keep the ingredient close to daily taste: a warm drink, a chilled sweet, a savory dish, and a sauce with quiet shine.

The older place thread often begins with Kuzu in present-day Yoshino Town, although the name has multiple explanations and should be read carefully. Wooden tablets excavated from Fujiwara-kyo include references to kudzu root, and early uses sit near medicinal and food contexts. Later, kudzu powder became clearer as a material for sweets and cooking from the Kamakura to Muromachi periods onward. In 2026, the manufacturing technique received a national intangible folk cultural property recommendation; for readers, the important point is the concrete practice behind that notice: winter roots, rough kuzu, cold-water refining, and hand-guided settling have continued in Nara since the seventeenth century.