If you want try the best Aapam here in Chennai, then head to Nalaas at Velachery, OMR, or Chrompet. I did not know about it until my friend introduced me to this outlet, which is on the way from work. They have an open kitchen where you can see the aapam being made right before you over the sizzling flame- its such a work of art!
The Aapam is typically had with stew which is equally delicious, but I did not have it here at Nalaas, infact I had it in Kerala on one my weekend vacations!
Nalaas serve both good veg and non-vegetarian dishes, though I primarily went for thier Aappam for which they are so famous!