Or Butterfly pea flower, is a plant that is found in Indonesia. The flower is often dried and crushed to use in teas and drinks to add a blue coloring to them.
Teas or drinks that include butterfly pea flower will often turn a nice bright blue color. However, if the drink is mixed with lemongrass or any acidic foods, the color will then turn to a nice violet. A small amount of this powder does not change the flavoring, only the color.