茶 is tea, 餐 is meal (e.g. 早餐 is early meal aka breakfast) and 廳 is hall, so it's tea dining hall or tea restaurant.
About This Dish
Hong Kong style cafes, known as cha chaan teng, arising from the hustle and bustle of post-WWII Hong Kong, serve a mixture of Hong Kong style Western foods (e.g. Hong Kong-style sandwiches) and Chinese food.