Shiratamako: The Granular Rice Flour Used for Japanese Sweets
Shiratamako is made from glutinous rice and is commonly used for Japanese dumplings and sweets.
Shiratamako is made from glutinous rice and is commonly used for Japanese dumplings and sweets. Unlike finely powdered mochiko, it often looks like small pale granules. Those lumps are part of the product, not evidence that somebody stored the bag badly.
Why the processing matters
Producer Gishi explains that shiratamako is made by wet-grinding soaked glutinous rice and drying the material. Mochiko uses a different production process, so the two flours have somewhat different properties even though both begin with glutinous rice.
Hinode describes its shiratamako as producing a smooth, elastic dumpling. That desired texture is a reason to buy the specified flour rather than treating every rice powder as equivalent.
Mixing a dough
A recipe should specify the amount and kind of liquid and the cooking method. Work the granules into the dough as directed, rather than judging hydration only by how quickly a fine powder would disappear.
For a first attempt, choose a simple shiratama preparation that identifies shiratamako explicitly. Make the pieces consistently sized so that the cooking guidance applies evenly across the batch.
Can mochiko replace it?
Sometimes a recipe supplies that alternative, but handling and finished texture can change. Follow the author's adjusted method when one is provided. A substitution is more useful when it tells you what result to expect than when it promises that every white flour is effectively the same.
Buying the right bag
Look for shiratamako or the Japanese name 白玉粉. Read the ingredients and preparation directions, particularly if the package is a mix or a special product. Keep those directions when decanting the flour into a jar.
Shiratamako is also called sweet rice flour in English, but that broad wording alone may identify another glutinous-rice product. The more specific name is the helpful part of the shopping list.