tea sommelier n. a restaurant worker employed as an expert on teas. (source: Double-Tongued Dictionary)
Further reading
Why is an insulated sleeve for a beverage called a koozie, often spelled koozy, coozy, coozie, and other ways? Any relation to a tea cozy used to keep a teapot warm? In Australia, a coozie is often called a stubby holder, a stubby or stubbie being...
Gene calls from the Badlands of South Dakota to ask about ordering a glass of water at a restaurant by asking for a blue dolphin neat. Is that widely used? There are many slang terms used when ordering water, such as windmill cocktail, city coke...