Guardian article about 'bubble tea' very interesting for those of you who are not so well informed on this type of tea.
Bubble tea is a big thing in Asia – everyone loves it: creamy, sweet, often flavoured tea with chewy black tapioca pearls bobbing at the bottom of a tall cup, and a big straw with which to slurp them up. There’s a general misconception that these chewy tapioca pearls are the bubbles – but they’re not. They’re just the pearls! The bubbles in bubble tea come from the fact that the drink, once prepared, is shaken in a cocktail shaker to produce actual bubbles and make the drink frothy.