Hi, I’m Yu.
In Japan, the relationship we have with green tea goes beyond a simple beverage; it is a foundation of our daily wellness. While many enjoy hot tea, the method of Mizudashi—or cold brewing—is a secret I have practiced for decades. It is not just about the smooth, sweet flavor profile that lacks the astringency of hot tea; it is about maximizing the extraction of beneficial catechins, specifically Epigallocatechin gallate (EGCG), which are better preserved at lower temperatures.
Why Mizudashi Matters
When you brew tea with boiling water, you extract tannins and caffeine rapidly, which creates that sharp, bitter taste. By using cold water, we slow down the extraction process. This allows the L-theanine (the amino acid responsible for the calming, sweet umami flavor) to dominate, while the catechins are released steadily over time. It is a gentle, efficient way to hydrate and fortify your body.
Yu’s Golden Rule for Mizudashi
To maximize catechins, use a 1:50 tea-to-water ratio and let it steep in the refrigerator for at least 4 to 6 hours. Never use boiling water; always use cold, filtered water to ensure the delicate compounds remain stable. If you want a stronger concentration, gently swirl the pitcher halfway through the process to circulate the leaves without bruising them.
The Simple Process
Brewing at home should be effortless. We focus on quality leaves and patience:
- Measure: Use 10 grams of high-quality Sencha for every 500ml of cold, filtered water.
- Combine: Place the leaves in a cold-brew pitcher or a simple glass jar. Pour the cold water over the leaves.
- Steep: Place the vessel in your refrigerator. Leave it for 4 to 8 hours. The longer it sits, the more profound the umami notes become.
- Filter: Strain the leaves immediately after the desired time to prevent the tea from becoming overly bitter.
This method is part of a larger philosophy of mindful living. Just as I advocate for mindful eating to improve digestive efficiency, I believe that how we prepare our drinks is a direct reflection of how we care for our longevity. Enjoy your cold brew as part of a balanced routine, perhaps alongside a meal prepared with the principles of Ichiju-Sansai.
