牛刀を天然砥石の相岩谷で研いで大根を切る🔪 〜Sharpen a Gyuto knife with a natural whetstone, Aiiwatani, and cut a Japanese white radish〜 #研ぎ #切れ味抜群 #包丁 #大根 #knife #sharpening #japanesewhiteradish