Cheese is one of the oldest milk products prepared with the help of microbes. The curd is separated from liquid part or whey to form cheese. Dosa, Upma and Idli are fermented preparation of rice and black gram. The two are allowed to ferment for 3-12 hours with air borne Leuconostoc and Streptococcus species of bacteria. Toddy is a traditional drink of some parts of South India which is made by fermentation of sap of palms.