Easy to find, right across the road from the Kowloon Shangri-La is Yat Chui Pavilion Dim Sum which is, as the name suggests, a Dim Sum restaurant.
I ate here twice during my brief Hong Kong visit.
The menu is typical Chinese dim sum fare. I only tried a couple of dishes but all were good.
I can recommend the pork and prawn dumplings, as well as the roast pork buns.
Cheap, cheerful and decent service. All round a good place for a good meal.