Traditional Atlanta cooking is just good southern cuisine from fried chicken to fresh vegetables and sweet iced tea for lunch to biscuits, grits, country fried ham with red eye gravy, cat heads (biscuits covered in sausage gravy) for breakfast. For that type of meal, Mary Mac's can't be beat and it's not far from the Peachtree Plaza at all, east on Ponce de Leon. At the same time, the massive influx of immigrants over the past 10 to 15 years has made Atlanta one of the best places in the world for different ethnic restaurants. Thai, Korean, Vietnamese, Latin American, African, and Middle East cuisine is everywhere.
However, one restaurant that is unique to Atlanta (and Athens) is the Varsity. It is also probably the oldest continuously open restaurant in Atlanta, having first opened in 1928. It is the world's largest drive-in and also has and indoor capacity to seat hundreds. If you like this sort of food, (chili dogs, hamburgers, fries, onion rings, fried fruit pies) it is one of the best of it's type in the U.S.. My favorite meal there is a chili-cheese steak with pimento (chili burger with melted pimento cheese), a toasted chicken salad sandwich on rye, an order of the best onion rings in the world, two P.C.'s (Pure Chocalate milk over shaved ice) and a fried peach pie. Not for the faint of heart or the delicate of stomach, but once you've had it, you'll want to go back. I've been going there since the mid-1950's and I still get the occasional "Varsity Attack". I live closer to Athens, GA than Atlanta, but you can't beat the original on North Avenue for the atmosphere, so I occasionally drive the 65 miles to get there. Just catch the MARTA train north from Peachtree Center station a few stops to North Avenue station and walk a couple of blocks.