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Once a novelty beverage, boba or bubble tea has moved into the mainstream. It's an unexpected turn for Chui Shui Tang, the teahouse in Taiwan that says it pioneered the beverage in the 1980s.

Taiwanese tea brand YiFang sells the Mudflip, a drink so popular that it's only served two times a day and is limited to one per person. The Mudflip is made with tapioca pearls, brown sugar ...