Fermented Rice Bran Bed -河村さんちの鉄粉ぬか床 1kg-This Fermented Rice Bran Bed Uses Iron powder. Thanks to it's natural salt properties, it has a saltiness that brings out the taste of vegetables. Hokkaido dashi kelp and natural shiitake mushroom powder are used which result in a delicious and long lasting flavor. Only requiring 1 liter of water, you'll be pleased at how easy it is to make! (If you add about half a cup of beer, the fermentation will be faster.) When pickling carrots: Carrot: Divide