Jitra, the 4th largest town in Kedah after Alor Setar, Sungai Petani and Kulim do have few famous restaurant selling Thai food, and due to the close proximity to the Thai border, the Thai food served is authentic and good.
One of the most famous restaurant is Rung Reang, a restaurant even known by few of my friends from Kuala Lumpur.
The crowd here is amazing. We reach there around at 9 PM, and almost all table were full. We were also told that we need to wait quite long for our food.