Kyusu: The Japanese Side-Handle Teapot

What Is a Kyusu

The kyusu is Japan's definitive teapot — a side-handled vessel designed specifically for brewing Japanese green teas. While the word "kyusu" can refer to any teapot in Japanese, it most commonly denotes the yokode kyusu (side-handle teapot), which has become synonymous with Japanese tea culture.

The kyusu's design reflects centuries of refinement around a single purpose: extracting the best possible flavor from Japanese green teas — {{glossary:sencha}}, {{glossary:gyokuro}}, kabusecha, and other shade-to-sun-grown cultivars. Every element of its construction, from handle angle to strainer type, serves this purpose.

Why the Side Handle

The side handle is not merely an aesthetic choice — it is an ergonomic innovation that fundamentally improves the brewing experience for Japanese teas.

Japanese green teas require precise, gentle pouring to control extraction. The side handle allows a natural wrist rotation to pour, which provides finer control over pour speed than a rear-handle teapot. The motion is similar to pouring from a pitcher — intuitive, smooth, and easily modulated.

The one-handed pour also leaves your other hand free to manage the lid, which is important when you want to adjust the gap for different leaf sizes. Traditional Japanese tea preparation often involves serving multiple cups simultaneously — pouring a little into each cup in rotation to ensure equal strength — and the side handle makes this back-and-forth pouring motion fluid and comfortable.

Kyusu Materials

Tokoname Clay

Tokoname, in Aichi Prefecture, produces the most famous kyusu. Tokoname clay, particularly the iron-rich vermillion variety (shudei), is prized for its ability to soften the astringency of green tea. The iron in the clay reacts with tannins, reducing bitterness and producing a smoother, sweeter brew. This is not subtle — the difference between the same sencha brewed in Tokoname clay versus porcelain is immediately noticeable.

Banko Clay

From Yokkaichi in Mie Prefecture, Banko clay is another traditional kyusu material. It has excellent heat retention and produces a round, full-bodied brew. Banko kyusu are often slightly thicker-walled than Tokoname, making them better suited to teas brewed at higher temperatures.

Porcelain (Arita, Hasami)

Porcelain kyusu from Arita or Hasami in Saga Prefecture offer neutral flavor and easy maintenance. They are a good choice for tea enthusiasts who want to taste the tea without material influence, or who brew multiple tea types and do not want to dedicate separate clay pots.

The Strainer System

The internal strainer is a critical component of kyusu design and a major quality differentiator. Kyusu use several strainer types:

Sasame (ceramic mesh): Fine holes cut directly into the clay wall of the pot, forming a built-in strainer. This is the traditional and preferred type for high-quality kyusu. Sasame strainers do not alter water flow, are part of the pot's structure, and filter even fine-leaf teas like fukamushi sencha effectively. They require careful cleaning but last the lifetime of the pot.

Wire mesh (stainless steel): A separate metal strainer inserted into the pot. Easier to clean and more effective at filtering very fine particles, but some purists believe the metal slightly affects taste. Wire mesh is standard on mass-produced kyusu and is perfectly adequate for daily use.

Obi-ami (belt filter): A ceramic band strainer that wraps around the inside of the spout area. Less common but effective. Found on some artisanal Tokoname kyusu.

For deep-steamed (fukamushi) sencha, which produces very fine leaf particles, a large sasame or fine wire mesh strainer is essential. Standard strainers may clog with fukamushi particles, resulting in slow, frustrating pours.

Choosing Your Kyusu

Size: 200-350ml is standard. A 250ml kyusu brews 2-3 Japanese-style cups (the traditional yunomi holds about 80-100ml). Larger kyusu (400ml+) exist but dilute the leaf-to-water ratio that Japanese brewing depends on.

For sencha and gyokuro: Choose Tokoname shudei clay with a fine sasame strainer. The iron-clay interaction genuinely improves green tea flavor. Size: 200-280ml.

For bancha and houjicha: Any material works well since these robust teas are forgiving. Porcelain or Banko clay in a larger size (300-350ml) is practical for household use.

For all-purpose use: A porcelain kyusu with a fine wire mesh strainer handles every Japanese tea type competently.

Brewing with a Kyusu

1. Preheat: Fill with hot water, swirl, pour into cups (this preheats both).
2. Add tea: 5-8g for a 250ml kyusu (more for gyokuro, less for bancha).
3. Water temperature: 70-80 degrees for sencha, 50-60 degrees for gyokuro, 90+ degrees for bancha and houjicha.
4. Steep: 60-90 seconds for first infusion of sencha. 120 seconds for gyokuro.
5. Pour: Rotate between cups, pouring a little into each in sequence, then reversing. The last drops are the most concentrated and flavorful — pour them out completely.
6. Second infusion: Add hot water and pour almost immediately (5-10 seconds). The leaves are already opened from the first steep.
7. Third and fourth infusions: Increase temperature slightly and steep for 30-60 seconds.

Care

Rinse with hot water only. Never use soap. For clay kyusu, remove spent leaves immediately to prevent staining. Clean sasame strainers by running hot water backward through them — pour into the spout and let water flow out through the strainer into the pot body. Allow to dry with the lid off. Store in a well-ventilated area.