KOI Thé near Yew Tee MRT is a bubble tea shop at 61 Choa Chu Kang Drive, #01-03, Choa Chu Kang, Singapore, rated 3.1 from 76 Google reviews.
A good bubble tea depends on three things: the tea base, the sweetness, and how fresh the pearls are. Tapioca pearls harden as they sit, so small batches usually taste better than pearls left in a warmer for hours. Start with a lower sugar level than you expect, since syrup can drown out the tea. For a first visit, a classic milk tea with standard pearls shows you the base before you try the seasonal flavours. Many shops run queues at lunch and after school, so a quieter time of day can mean a fresher cup.
Choa Chu Kang is a residential town with a mix of estates and malls, so the shop serves people who live nearby and those passing through on their way to the MRT.