VNE - By Quynh Nguyen November 17, 2023 | 11:15 am GMT+7 Customers wait in line to buy coin pancakes on Hoi Vu Street, Hanoi, September 2023. Photo by Thanh Lan When Kieu Oanh heard that the latest new drink, hand-pounded lemon tea, had become popular in Hanoi, she did not hesitate to travel 30 km…