Vazhai Thandu Kootu is a South Indian dish made with banana stem (Vazhai Thandu), lentils, and coconut. It is a healthy and nutritious dish that is usually served with rice or roti. The banana stem is known for its medicinal properties and is rich in fiber, vitamins, and minerals. To make Vazhai Thandu Kootu, the banana stem is cleaned, chopped, and cooked with lentils, spices, and coconut paste. It is a flavorful and delicious dish that is popular in South Indian households.