Inside the cramped premises of Hong Kong Family Food, a two-dish-rice restaurant in Causeway Bay, 59-year-old Lo Hung-wan toils away serving up takeaway meals for her customers. “It is very busy during the lunch rush; I won’t even bother to answer the phone during this period,” said Lo, one of the restaurant’s operators. “During those couple of hours, it feels like we are fighting a war.” Two-dish rice is a type of meal that allows diners to select two pre-cooked main dishes of their choice...