Lassi is the by-product of deshi butter prepared in house-holds and called chhas or matha. Lassi is appreciated throughout the country as beverage for its palatability and as thirst quenching/refreshing drink. It is also known for its therapeutic values. The palatability and wholesomeness of the product depends on the quality of curd churned and temperature of churning. An average curd obtained by fermentation with contaminants produces a highly sour or off-flavored lassi, unfit for human consumption.