Can't imagine those college days without Navtara. This was our fix place for lunch. This is one of the best Udipi restaurants in Goa, though it serve north Indian cuisine too. They have normal seating for the lower level and fine-dining on upper.
It is a pure veg restaurant and all the south Indian snacks served here are authentic and yummy.
If you opt for a lunch here, I shall strongly recommend their paneer tikka for starters. It just melts in your mouth. Than you can go for any north Indian dish for the main course.