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In page Clitoria ternatea:

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Butterfly pea flower tea is made from the ternatea flowers and dried lemongrass and changes color depending on what is added to the liquid, with lemon juice turning it purple.[1] In Thailand and Vietnam, this butterfly blue pea flower tea is commonly mixed with honey and lemon to increase acidity and turn the beverage a pink-purple color, to produce for a drink usually served after dinner, or as a refreshment at hotels and spas.[2] The drink is a typical local drink like chamomile tea is in other parts of the world.[2] The tea is found in both hot and cold varieties [3]