Eeya Sombu is actually made of an alloy of tin and other metals and NOT Lead as is wont to be believed by a few. Lead is referred to as Kaareeyam and Tin as Velleeyam. Eeya Sombu is made of the latter. This is amply evident by the fact that our older generations had consumed this rasam for several years and remained healthy for long. Had it been a case of Led Poisoning this certainly would not have been possible.So if anything it is only said to provide health benefits, when consumed in the right quantity, that help the neuro responses of the human brain.
Of course one has to guard against spurious manufacturers and buy it from authentic places. Because an Eeya Sombu that weighs approximately 500gms costs close to Rs.1300/- . Kumbakonam in Tamil Nadu is said to be famous for these Sombus. For those who have had Eeya Sombu Rasam any other would never be palatable. Even in weddings caterers are known to drop a small Eeya Sombu into the rasam [ since it is not practically possible to get such a huge Sombu ] after it is prepared to lend that extra flavor. If some of you are still in doubt about using a sombu, you can prepare the rasam and then transfer it on to an Eeya Sombu and then serve.
While using Eeya Sombu one has to ensure that there is enough liquid in the vessel.
Always cook in low flame.
Never move too far away from the kitchen when the rasam is being made. For if you do, you may neither find the rasam nor the sombu.