All parts of the plant are used in medicine in different countries, and the flowers or the blue variety are dipped in batter and fried in Burma. They are edible and would make good garnishes for salads, as do nasturtium flowers and lavender. In Thailand a syrupy sherbet drink is made from the blue flowers, and a tea or tisane which is a rich blue colour. You make the tisane by pouring boiling water over the petals and leaving them to infuse for 15 minutes before straining and drinking, flavoured with honey if necessary. In the Malaccan islands the flowers and seeds are used to make a blue dye. The seeds (there are between 8 and 11 per pod) contain tannins.