Sencha kyusu brewing

Kyusu brewing is the canonical Japanese approach for sencha, gyokuro, and other Japanese green teas. The kyusu — a side-handle teapot with built-in fine mesh filter — was specifically developed for Japanese tea's requirements: lower brewing temperatures than Chinese green tea (which scorches sencha's delicate amino acids), the broken leaf form of fukamushi sencha that needs robust filtration, and the multiple-infusion practice that Japanese tea culture has refined over centuries.

The defining technical detail is temperature precision. Sencha typically brews at 60–80°C — below the Chinese green tea standard. Premium gyokuro brews even lower (50–60°C), where the lower temperature emphasizes umami and sweet character while suppressing astringency. Hojicha (roasted green) brews at 90°C+ since the roast character is more heat-tolerant. The yuzamashi (cooling vessel) is the traditional tool for managing this: boiling water poured into a yuzamashi cools by 10–15°C before being poured into the kyusu, giving sencha-appropriate brewing temperature without measuring. The technique typically yields 2–3 infusions per leaf charge — the first emphasizing umami, the second sweeter and more balanced, the third sometimes showing surprising complexity.

Brewing parameters

Equipment

• Kyusu (Japanese side-handle teapot with built-in mesh filter)
• Small cups (~80ml)
• Yuzamashi (cooling vessel) for temperature control

Common mistakes to avoid

1. Using boiling water with sencha (scorches and produces bitter, vegetal-aggressive cup)
2. Skipping the yuzamashi step (water arrives too hot)
3. Over-steeping (sencha extracts faster than Chinese green; 30-60 seconds is often enough)
4. Using a Western teapot or French press (the kyusu's built-in filter handles broken-leaf sencha; substitutes produce particulate-heavy cups)

Cup outcome

Bright green liquor; umami-forward; multiple infusions each emphasizing different aspects (savory first, sweeter second, often complex third).

Best for tea types