what we call rasam is one of the most favourable dish for Indian's meal.preferable in cool weather. It is also good for digestion.

Rasam
Ingredients for powder

Coriander seeds - 1 tsp;   Cumin seeds - 1 tsp; ;
Red chills - 2-nos;   Black pepper - 1/4 tsp. ...Grind to a  coarse powder.
Ingredients for Rasam;
Tamarind - a small lime sized ;     Curry leaves  few;        Coriander leaves - 1 tbsp chopped.
Salt - 1 tsp ;   turmeric pwdr 1/4 tsp;    Water - 3-4 cups;    tomato-1
seasonings;
mustard; fenugreek;   Asafetida - ¼ tsp;  dry chili -2 cut peaces, c/leaves.
Step;
In  a  vassal desolve tamarind with 4 cups  of water.add all  the above items { c/l to tomato}  & blend it well with by  hand.,  Add rasam powder to it & mix well. {need 1   1/2  tsp pwr].  Heat a pot,   pour oil a tbsp,   season the items shown,  when aroma comes pour the rasam allow to boil once & off it. need not boil more than once. Now its ready. Serve hot as a soup or with  rice.
note:  using fresh pwr  adds to the taste and flavor.But  can use storage or ready made  also