Multi-purpose idli/dosa batter is a versatile and essential staple in South Indian cuisine. Made from a combination of rice and lentils, this batter is fermented to create soft and fluffy idlis or crispy dosas. It can also be used to make uttapams, paniyarams, and other South Indian delicacies. The batter is easy to prepare and can be stored in the refrigerator for up to a week, making it a convenient option for quick and delicious meals.