Roselle and bael fruit are probably the best-known of the traditional teas. Roselle is a type of hibiscus (specifically, Hibiscus sabdariffa) and makes the most tasty Thai tea. If you find the petals, dissolve a couple of handfuls in a liter of water and boil for 20 minutes. Boiling longer creates a deeper purple-red and more concentrated taste. Hot and straight, with a twist of lime, roselle might pass ...