Shochu is Japan’s answer to vodka. It has a smooth flavor and fewer calories than vodka. Unlike vodka, shochu has the distinct flavor of koji. The koji flavor isn’t as pronounced in shochu as it is in saké and lends itself well to cocktails. The Silver Dragon is a variation on the Greyhound, replacing the vodka with shochu and changing the grapefruit-to-liquor ratio to a more martini-like stiffness.
Combine all ingredients over ice in a cocktail shaker.