There may be lot of varities of rasam, this one is my favourite. This recipe is my mom -in-law's. I adhere to her method. Lets make the podi 1st then the rasam.
How to make Rasam Podi
Ingredients
Toor Dal - 1 cup
Corriander seeds (Dhania) - 3 cups
Pepper corns - 3/4 cups
Red chillies - 4 to 5
Cumin Seeds (Jeera) = 1/2 cup
Preparation
In a kadai, dry roast coriander seeds, Chillies, Pepper, Toor dal. When it is almost done, add Jeera and transfer it to a plate to cool. Then grind this. (Consistency - not too coarse not to fine).
This is Rasam Podi.
How to make the Rasam
Ingredients
Tomato - 2 chopped
Tamarind - a small lemon sized
Turmeric - 1/2 spoon
Asafoetida
Toor dal - 1/2 cup
Corriander leaves
Ghee - 1 spoon
Mustard
Curry leaves
Salt
As the 1st step, wash the 1/2 cup of toor dal, pressure cook it by addling little turmeric. When that is done, take a spoon and mash it well by adding a little water. Keep this aside.
Then in a small bowl, take the tamarind &1 1/2 glass warm water, extract the juice well & throw the residue. To this tamarind add, a little turmeric, salt, a pinch of asafoetida and; bring it to boil.
Add the tomatoes. When the skin of the tomatoes peel away & the mixture boils up, add 3 spoons of rasam podi and bring it to boil. When the mixture rises up, stir well. The aroma of the rasam will rise.
Now, add the cooked & mashed toor dal into this. Also add the corriander leaves. And when it boils and rises up, take it off the gas.
If its over cooked, the rasam give a burnt taste. So make sure you dont over heat it.
The rasam is almost done.
Now we have to season it. In a skillet, heat ghee add mustard seeds, when its spurts, add some cumin seeds, a pinch of asafoetida and then the curry leaves. When done add this to the rasam.
Delicious Rasam is done.
Few tips: If ghee is not available, we can use oil.
When the curry are added, it will spurt out. So, we can have a lid handy. So when we add these curry leaves to the kadai, we can immediaely close it. This avoids spill overs of the mustard seeds on the gas & spurting out of the ghee/oil on our hands.
Rasam can be mixed with rice and taken. It can be eaten with any Kariamudhu (curry).
The Ingredients in the rasam actually helps in enhancing digestion.