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.

It's an unexpected turn for Chui Shui Tang, the teahouse in Taiwan that says it pioneered the beverage in the 1980s. Chun Shui Tang started as a traditional teahouse selling tea leaves — a dime ...