Stuffed Mushroom Kola Urundai is a delicious South Indian appetizer made with button mushrooms and a flavorful mixture of spices and lentils. The mushrooms are stuffed with a mixture of ground lentils, onions, and spices, then shaped into balls and deep-fried until golden and crispy. These kola urundai are perfect as a party snack or as a side dish with rice and sambar. The combination of the earthy mushrooms and the spicy lentil filling makes this dish a crowd-pleaser.