How do they make bubble-tea tapioca pearls black?

Question

How do they make bubble-tea tapioca pearls black?

Answer 1

You make a strong tea brew either green or black tea, strain out or remove the bags and then cook the pearl tapioca in the tea with a bit of sugar and the tea colours the pearls, I worked in Asia and have a friend here in Toronto Canada who's family runs a chain of shops selling Bubble tea, and my Vietnamese friends do the same.