Mysore Rasam

Ingredients:-
Tamarind - 1 lemon sized
Tur Dal - 2 Tbsp
Hing
Salt
Mustard
Curry leaves - few

Fry in little oil and grind to paste:
(Do not fry cumin, grind it raw with other fried ingredients)
Red Chilli - 3
Tur dal - 1 sp
Gram Dal - 1/2 sp
Cumin - 1/4 sp  
Dhaniya - 1/2 sp
Pepper - 1/4 sp

Pressure Cook the Tur dal.
Extract pulp of tamarind adding about 1 cup water. Boil it adding hing for about 6-8 mins.
Add the ground paste,salt to it and boil further for couple of minutes.
Add the cooked tur dal and boil for further few minutes.
Temper with mustard and curry leaves.