Poor people ate vegetables, fish, salt, cheese, fruits, nuts, and olive oil. Meat, especially beef, was usually not eaten. Breakfast was usually not eaten and, for lunch, leftovers were used. Rich people ate dinner before four in the afternoon. They usually ate from three to ten hours. Hands were washed between the courses. One emperor served 22 courses at his dinner parties. If visitors were invited to dinner, slaves were sent to bring them on time, because water clocks did not always work the same. People enjoyed eating grapes for dessert. At first, cold clams and oysters were eaten for dessert, but later people ate them at the beginning of a meal instead.