how do 1. Clean the butterfly pea flowers, bring them to the boil with clean water until it was dark blue
2. filter out the butterfly pea flower, and then add sugar, bring back to boil until dissolved. Leave them cool
3.the butterfly pea flower syrup mixed with caustic soda, sweet taste and cut it with lime juice and serve the needs of people with ice water with lemon juice to make the butterfly pea water reaction, change to the purple)
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