Cantonese gaau ji are standard fare in a dim sum meal.
Dim sum is a Cantonese dining tradition built around small portions of savory and sweet foods, including dumplings, steamed buns, rice rolls and pastries. Restaurants commonly serve these dishes from steamers or carts, allowing diners to choose several items for the table rather than ordering one large entrée.
Gaau ji fit naturally into this format because their small size and delicate wrappers suit steaming. The article notes that Cantonese versions are often smaller and thinner-skinned than northern Chinese jiaozi, making them especially appropriate for dim sum service.
The alternatives describe different dining contexts. Teppanyaki centers on food cooked on an iron griddle, izakaya are Japanese pubs serving varied small dishes, and hot pot is a communal cooking meal. A dim sum menu may include many dumplings, but gaau ji refers to a Cantonese form of jiaozi rather than to every dumpling served there.