Powdered ingredient in sweet teas and smoothies

TARO

This starchy root is often turned into a vibrant purple powder and is a staple in Hawaiian and Southeast Asian desserts.

This clue points to "taro," a starchy root vegetable often ground into a purple or white powder used in bubble teas, desserts, and smoothies for its slightly sweet, nutty flavor. The word "powdered" hints at its processed form, while "sweet teas and smoothies" narrows it down to a common ingredient in those drinks. Taro is especially popular in Asian cuisines, where it’s also used in pastries and as a thickening agent.