In search of the secret to the bubbles in bubble tea, Kate Quilton visits a cassava farm in Kenya to get to the root of it. Jimmy Doherty is in Somerset exploring why sour milk is sneered at, though soured cream is revered. Plus, Helen Lawal reports from Portugal on canned fish.

What's the 'flower' in cauliflower wonders Kate? Plus the long life of lemon juice. And a fess-up at the brewery as the meaning of 'bottle conditioned' beer is revealed.

Kate's in Kenya wondering how do cold-brew and iced-coffee differ? News from Staffordshire on why parsnips are so sweet. And do frozen pastries taste as nice as fresh pastries?