Yowsa! Fantastic dim sum at a great price. From outside, you might think it looks like a bit of a dive, but inside is clean, spacious, and well looked after. I love how, after patrons leave, the waiters just grab the plastic table-cloth and scoop up all the dishes in one big bundle. There's no cart service, but if you find cart delivery to be intimidating, that's a bonus.
The har gau and siu mai are as good as it gets. Try also the rice steamed in a lotus leaf, and the dumplings with shrimp and bamboo fungus (sounds awful, tastes divine).
Let's face it. Dim sum is addictive. Rol San is a fantastic place to get your fix.