Shiso - also called beefsteak leaf - is a fresh herb with broad, jagged-edged green or purple leaves. Related to mint, shiso blends its delicate minty subtleties with citrus and licorice; the flavor of the purple leaves is more fruity and less minty than the green. The herb is readily found in Japanese and many other Asian markets. In Japanese cuisine, green shiso is added to sushi, soups, salads, sashimi, and tempura. Purple shiso is used most in pickling. Either green or purple shiso leaves show off well in salads.