Vengayam rasam is a south indian soup which is prepared using shallots. Though this recipe sounds simple, it is very special for me as it's my granny's recipe. Normal onions can also be used in this recipe but adding shallots enhances the flavor of rasam. No grinding and spice powders required for this rasam. Easy to prepare yet flavorful and this goes well with hot rice along with kootu, poriyal and spicy curries.