Pardon me for the caps in the review title. If you want to try authentic veg Udipi/Kannada food, there is literally no other choice in Mumbai. The staff may seem rude but in reality, they are just frank and genuine.
When we went there, the manager/owner asked us whether we are coming for the first time. When we said yes, he said, "Do not even look at the other section. Just proceed to the thali section". And he was right. They serve unlimited thali with great food. We weren't able to get up after we finished.