Oryoki means literally just enough. It is a traditional Zen meal ceremony where the meals are served in eating bowls in the dojo (meditation hall) as participants are seated on their meditation cushions. Meal sutras are also recited during the ceremony.
Oryoki requires some instruction to learn how to mindfully handle the bowls, cloths, spoon and chopsticks and follow the sequence of the ceremony. Basic instruction in oryoki is given to new participants and it is gradually learnt through watching and following more experienced students.
Oryoki teaches us an elegantly simple, reverent and mindful way of eating.