My first encounter with dim sum in HK happened at Dim Sum Bar. I went to the one located at Gateway Arcade of Harbour City, which is near the Tsim Sha Tsui MTR station. Technically, my uncle drove me there and Lester and I had a nice "family reunion" lunch with his family. If you want to get there, you'll have to enter from the outside, so it can get a tad confusing if you're not familiar with the place.
No. 1 on my list (and collage) to try is the Char Siew Bao 叉烧包 (BBQ pork-filled bun). They do it with a modern twist like Tim Ho Wan; instead of having the bun skin all soft, white and tasteless, this bun is crispy on the outside and a little sweet. I really love how the crispy texture of the outside complements the BBQ pork filling, which is salty and flavourful. Can't ever get sick of this dish!