The only korean places I know that will let you grill your own food is Kaya on reed rd and "japanese restaurant" which is actually Korean on High st. Both places you have to request a table for BBQ otherwise they try to avoid it since it is more work for them.
Shilla also on Reed rd by the Sears hardware used to do it all the time but since the renovations I don't think the Kim's want to do it anymore even if you request. Also Kikyo on Riverside MIGHT do it because they are under Korean ownership as well.
IMO Kaya is the best korean place since the it was put under the most recent ownership. The original owners had a korean restaurant in Bethel Center close to the BW3's and they just weren't doing well. The new owner is the guy that used to own "korean restaurant" at the corner of Lane ave and High before it was knocked down and turned into a BW3's.
Oh and a decent buffet is located in Dublin in a plaza behind Tuttle crossing. You can order off a menu there also.
Don't go to Minga across from Micro center. I can't stand their service or food.
Sorry I can't be help on the Indian but what everyone else says seems on par. I only know so much on the Korean end because my Dad is friends with all the owners and was head of Korean commerce in Columbus for over 20 years :P