Consider a salad. It is made up of many ingredients. Yet we give then all one name: "salad." It's kind of funny.
The koan: "Sour Miso"
The cook monk Dairyo, at Bankei's monastery, decided that he would take good care of his old teacher's health and give him only fresh miso, a paste of soy beans mixed with wheat and yeast that often ferments. Bankei, noticing that he was being served better miso than his pupils, asked: "Who is the cook today?"
Dairyo was sent before him. Bankei learned that according to his age and position he should eat only fresh miso. So he said to the cook: "Then you think I shouldn't eat at all." With this he entered his room and locked the door.
Dairyo, sitting outside the door, asked his teacher's pardon. Bankei would not answer. For seven days Dairyo sat outside and Bankei within.
Finally in desperation an adherent called loudly to Bankei: "You may be all right, old teacher, but this young disciple here has to eat. He cannot go without food forever!"
At that Bankei opened the door. He was smiling. He told Dairyo: "I insist on eating the same food as the least of my followers. When you become the teacher I do not want you to forget this."
The enlightenment: "Okay," Dairyo said. But in his head he was like, "Nah."
This has been "Zen Koans Explained." Not what you've been told.