Kokumotsu Su (穀物酢), or Japanese grain vinegar, is a mild and versatile vinegar essential in Japanese cuisine. Made by Mizkan from a blend of wheat, sake lees, rice, and corn, it has a lighter, less acidic flavour compared to Western vinegars, with a subtle sweetness and umami depth. This makes it an indispensable ingredient for seasoning sushi rice, creating balanced salad dressings, or adding a gentle tang to marinades and pickles. For perfect sushi rice, gently fold this vinegar into freshly cooked short-grain rice along with a little sugar and salt while the rice is still warm. Its delicate profile enhances other ingredients without overpowering them, making it a staple condiment for any home cook exploring Japanese food. This vinegar is a cornerstone of the Japanese pantry, suitable for a wide range of culinary applications.