Lemongrass is drunk all over Asia as an aid to digestion, helping to kill off any nasties in your tummy. Originally from Malaysia, it flourishes in any humid clime. Well-known to us as an ingredient in Thai cooking, little did we know what a wonderful drink this makes too. Taste: An unexpectedly sweet lime & citrus drink. Try it: As it is, but why not add some of the cooled infusion to elderflower cordial for a sophisticated squash? Good if you're feeling: As toxic as a barrel of plutonium. This sweet herbal tea will refresh the system.