Yuzamashi: Do You Need a Japanese Water Cooler, or Just the Cups You Own?
A yuzamashi does not cool water. Cold ceramic cools water, and a yuzamashi is simply the largest, coldest, most repeatable piece of ceramic in a Japanese tea set. That distinction sounds like pedantry until you brew a second pot, at which point the bowl is warm, the arithmetic everybody quotes stops working, and your gyokuro…