We prepare buttermilk by diluting curd (yoghurt), and we also prepare creamy lassi using curd made of full fat milk. Spiced buttermilk is a traditional south Indian drink usually served after taking an elaborate lunch meal to improve the digestion. Buttermilk with jeera powder or chaat masala is popular in other parts of India. Lassi is usually served chilled as a dessert in almost every part of India.