It is a strong concoction made with at least 14 different types of herb, including fennel, rosemary and lemongrass.

BBC: The three colours of Ibiza

Visits to the former imperial city of Hue, a vegetarian Buddhist monastery and the herb farms around Hoi An follow (participants pick lemongrass, basil and cilantro and use them to make fresh spring rolls).

CNN: Exotic culinary tours around the world