Sunday Dim Sum was a family favourite of ours growing up and it still is when I go to Hong Kong to visit my Grandma.
It is essentially a Chinese version of brunch with lots of little dishes of dumplings. You will go in a big group with your whole family and sit around the table for a couple hours chatting away while all the plates of delicious dumplings and congee and rice and roasted pork etc continue coming out from the kitchen.
My current favourite in China Town is London Chinatown Restaurant. Everything comes steaming and fresh from the kitchen to your table, they have a good menu, the food is authentic, it all comes fairly quickly after you have ordered and it is really well priced. And the best thing is that you can usually get a table – which can be an issue on Sundays in China Town for Dim Sum.