Poorna Tiffins was a place introduced to us by my father's friend. A very unassuming place. No tables, no air conditioning. Only some chairs arranged in one half of the place and the other half used for cooking.
You get the world's best idlis there.
Every Sunday morning I religiously drive down to the place (my parents accompany me most of the time) and happily gorge down about XX (number has been censored) of those small, steaming hot idlis bathed in ghee. They even put ghee in the chutney (makes the chutney less spicy, some say)
But those idlis are truly heavenly. And the taste of the ghee makes it even better. You slowly take a piece of the idli, take a little chutney with it and put it in your mouth and you are transported to Paradise. The idli literally melts in your mouth and pampers your taste buds.
Other folks have other stuff on the menu like a dosa, pesarattu, puri etc. but I stick to the idlis!