Bhang

A green drink made of ground cannabis leaves in water at varying strengths. Sold only by government authorised shops and extra stalls seen during festivals (such as Holi). Popular with locals and tourists alike for the experience. Used in traditional Indian celebrations for thousands of years [Wiki]. Maggie and Paul Smart visit the festival and purchase a cup each. Paul realises that they are 'stoned' from his experience of smoking 'weed' in his youth.