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Determining what size of rice cooker you need is the first thing to consider when shopping for a machine. When measuring rice, Japanese people use a unit of measurement called gou (合), roughly 180ml. Gou is part of the shakkanhou (尺貫法) system of measurement, a traditional system that is no longer commonly used, but maintains its legacy as the standard for measuring both rice and sake. When you see the term “cup” in a rice cooker's description, it is likely 1 gou, not a metric cup (250ml) typically used in cooking and baking.
(Also, please note that 1 cup in modern Japan is equal to only 200ml, so please sure to adjust your recipes while cooking in Japan, and likewise if working off a Japanese recipe in the west.)
The shakkanhou system works like this:
One of the most frequently asked question we get during our onigiri-making workshops is "Which is the best rice cooker?". So, we will explain some points about rice cookers to help you make the best decision when shopping for yours.
As it is with many other products in this modern era, when it comes to rice cooker options, we have too many choices. If you visit Amazon.com, you will find 180 pages for this category. Each brand emphasizes the unique benefits of their products, and with prices ranging from around $20 to over $1,000 for one machine, it really becomes difficult to make an informed decision.