There are a lot of dishes that can be found in Chennai that are not found anywhere else. If you want to explore and eat foods that will delight your taste buds, you can try eating Idli and Sambhar. This is a common dish that can be found in Chennai. You can also try out Onion Tomato Uttapam.
The fresh taste of onions and tomatoes might be different from the usual food you have tried. Take note, expect that a lot of the dishes that you are going to eat will come with a serving (or two) of rice. The dishes have strong flavors that can be perfect with the bland taste of rice.