Butterfly Pea Flower Drink Commonly called “blue tea”, Butterfly Pea Flower has been brewed for centuries in south-east Asia. It has also been used in cooking to color dishes, especially rice dishes. It's an herb, so it doesn't contain caffeine, which makes it kid-friendly. Butterfly Pea Flower The bright blue color of Butterfly Pea Flower tea can change color based on the pH level of the substance added to it, such as lemon or lime, where it will turn purple or pink. In T