Sagar Ratna is one of the good southindian food chains Ive experienced. You can have a variety of southindian dishes and that too be served decently.
No matter if it is masala dosa or it is idli but if u eat it with gun powder....it tastes amazing.....
The prizes are a bit hiking but it is worth spending money on this kinda food.
It is a place where u can party with ur frnds or with ur family as well. Overall a good palce to dine/lunch for a good food.
Sagar ratna has so many chains or branches in Delhi but Ive heard abt some other chains of this restaurant by the name Sagar only but dont know if that is the branch of original one or not. So beware or confirm before going.
After food dont forget to have a mitha pan usually at the counter for Rs.5 each that tastes really nice after meal.