Bangkok: Platinum Mall
Across the pedestrian bridge, from Pantip Plaza, there is a small shop called "Pantip Khao Mun Kai". Khao mun kai is the Thai version of Hianese chicken rice, a little spicier sauce, less ginger. The place also can make pad see ewe and ladna.
Pantip Khao Mun Kai: http://goo.gl/maps/SutzZ
It's the shop with the Pepsi stuff in this photo / map.