Experiencing how residual sugar interacts with a wine's structure is key to understanding the many offerings from Alsace. Like grape variety and vineyard site, it's a component that can greatly affect enjoyment of a given wine or pairing. Hopefully, progressive labeling policies will help close the education gap. Meanwhile, wine drinkers should keep an open mind as they explore the wealth of offerings flowing from Alsace. Wine Spectator's Alison Napjus explains.