Non-glutinous rice (normal short-grain white rice)
Just as when you're preparing rice for cooking, thoroughly rinse the rice and let it soak in a generous amount of water. Soak the rice for about 3 hours and then drain well.
Spread the rice out in a dish and let dry. Dry it until you can crush it easily with your fingers.
Grind the dried rice in a mill.
Sift out the finer particles of the mill-ground rice using a sieve or a tea strainer.
For the rice that was not ground finely enough, grind it further with a mortar and pestle. Alternatively, if you don't have a mill, you can grind the rice using the mortar and pestle from the start.
Store in a tightly sealed jar or a Ziploc bag.
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Story Behind this Recipe
You can make rice flour easily by yourself. There are even rice farmers that own equipment to make rice flour.
It's hard to use a mortar and pestle to completely grind rice, so it's best not to make too much at once. You can make a little under 150 g of rice flour with 1 cup of rice.