Chinese-Thai shophouse.. stuck in time / Wikulpanich Salapao
Correct me if I'm wrong, but I'm pretty definite that this is the best place for Salapao, the Chinese steamed buns with either a savoury pork filling or a sweet bean-paste filling. You often find these sold by vendors on a motorcycle with sidecar. None are as tasty as the ones from this shop. Also the dim-sum-like "khanom jeeb" are pretty good. Just look at the pictures, this place seems stuck in a time-warp.
Tip for eating salapao: They're usually stuck to a piece of paper on the bottom. They taste a lot better if you remember to remove it first. :-S
The shop is called "Wikulpanich" (Wikoon-phanit, locally just called 'Raan Wikoon'). It's on Charoen Muang road, a road with mostly shophouses selling mechanical/industrial supplies and tools, as well as car accessories shops. After crossing Nawarat bridge coming from Thapae Road, go straight on to Charoen Muang and you will find this shophouse on the right hand side. The sign is in Thai only.