Bar Cham owner Byung-jin Lim reimagines the classic Negroni with soju, infusing Korea's national spirit with two other local ingredients: aromatic, pleasantly bitter dried mandarin peel and nutty, toasty Solomon's seal root. You can find the dried citrus and Solomon's seal, which is often sold as a tea, at Asian markets and online. While the name of the drink is a nod to Jeju Island's specialty millet soju, Gosorisul, feel free to substitute with any soju that's around 40 percent alcohol by volume.