Lemon Rice or Chitrannam -- This is a classic simple South Indian dish which is had on a day-to-day basis. It is made during festivals too. The lemon juice adds a real zing to the rice. You can make lemon rice in a jiffy, especially when you are in a hurry in the mornings. Lemon rice can be made with leftover rice too..
Looking out for more classic South Indian rice varieties, here are a few that you can try out - Tamarind rice or Puliyodharai, Tomato rice, Coconut rice, curd rice.