For pure vegetarian south indian delicious lunch must visit Madhuban in DLF phase, cross point mall in Gurgaon. It is known as Madhuban Sattvic South Indian Restaurant. It is have quite good comfortable seating arrangements, friendly restaurant with good staff, service here too quick. Much spacious and neat and clean restaurant.
They serve south Indian food in Plates and traditional way, not extra garnishing but food is very yummy, just finger licking sambhar [balanced sweetness and balanced sour ] crispy Dosa, Soft Idlis all looks and feels fresh good qulity and very yummy.
Just around 100 buck may any one can have good South Indian Pure vegetarian lunch. It is fully air conditioned at decent price.