Piquant flavor is a term used to describe a food or drink that has a sharp, spicy, and appetizing taste. ZEST and TANG are two words that can be used to describe this type of flavor. ZEST is the outermost layer of citrus fruits such as lemons, limes, and oranges, which contains essential oils and has a strong, tart flavor. TANG is a sharp, acidic taste that is often found in citrus fruits. Together, these two words can be used to describe a piquant flavor.