Natural food colouring

Clitoria or butterfly pea flower is widely used in South East Asia for natural blue color. It's known as "anchan" in Thailand and "bunga Telang' in Malaysia. Thai normally use this to colour their "khanom" or dessert, while Malaysian use it to give a hint of blue in their rice for "Nasi Kerabu" (herbal rice) recipe. 

 

blue rice
anchan