An old alchemists proverb says that sweet can only be derived from bitter. This elegant glass is aimed at achieving a harmonious blend of sweetness and bitterness, thus enhancing the paradoxical pleasures of these digestives. When drinking bitters or root and herb-based spirits the glass should only be one-third filled, since this will allow the bouquet of such drinks to be fully appreciated. Herb and root spirits vary in alcoholic strength, but most have a bitter taste and also possess certain healing qualities.