On the way from Thiruvananthapuram railway station to Padmanabhaswamy temple road or east fort bus stop road, around 300-400 meters from railway station just oposite Pazhavangadi Ganapathi temple i found this Annapoorna pure vegetarian restaurant for lunch.
It was crowded at afternoon. Lunch severed on banana leaf. We went to family room for lunch where Thali with bana leaf inside (lunch plate) was served with 8 curry with 1 chapati 1 papad + payasam, curd ( dahi) salt, fried chili with a small cup of ice cream! which cost me Rs 90 (as on 24th Sep 2013)
Food was tasty, hotel was clean and good service. I've visited twice in this restaurant just for lunch.