Given the limited time that you have, I'm not sure if it will be wise to venture out as you could get stuck in traffic, and then have to rush back to catch your flight. Although getting out of the airport might be a good enough incentive as the airport lounge was not great. If you want to venture out for a good meal, perhaps try the nearby airport hotel's restaurants.

I stayed at the Courtyard Marriott which is about 30 minutes away, and their restaurant served yummy Chicken Tikka Masala! On my other trip, I stayed at Le Meridien which was only 8 minutes away, and their coffee shop wasn't bad. You can try their Chicken Briyani.

P.S. The airport lounge that I was in did not have wi-fi when I was there in January 2007!