@Artemisfoul1812 suggested a little place on Briggate called Saengarun with a very reasonable lunch menu, 2 courses for £9.
The decor is very basic and minimal with a few oriental images around the room, it's pretty much the opposite of the highly decorated rooms of some oriental and Asian restaurants.
We were given the menus to look through and I'm usually not one to stick to a set lunch menu when given the option of the full menu.
I opted for the Poh Teak to start, a Fisherman's soup with squid, mussels and king prawns.
For my main I went for Gaeng Ped Yang, boneless duck in a coconut milk based red curry with pineapple and Thai basil.
We didn't get any desserts because we were too stuffed.
Service was good, quick and efficient and we didn't have to wait long for our food. The final total came to £34 for a set lunch menu, 2 courses off the full menu, 2 beers and a coke. Excellent value
I would quite happily put this place as one of my top places to eat in Leeds simply because the food is epically good.