The lesson
One mee, and the counter conversation
It is 12 noon, and there are 8 people in the queue for my Hokkien Mee. An uncle reaches the counter and says, “One mee.” So I cook the plate I cook 400 times a week. The safe plate. Correct, generic, and nobody’s favourite. Two customers later, an aunty leans in. One mee, she says, but no prawns, extra sambal on the side. Same wok, same chef, and 2 very different plates.
The order steers the chef
That stall is your chat window. The prompt is the order, and the order steers the chef. Ask a chatbot to “write something about food”, and you have said “one mee”. Back comes the safe essay, correct and forgettable. Now ask it to “write a two-line birthday verse for my Ah Ma, who turns 90 today and still beats me at mahjong”. Now the model has something to hold. A person. A family joke. The words you choose decide what comes back. There are people now paid to write such orders for a living. The job title is prompt engineer.
Remember the master chef from the last lesson, who has read every recipe in the world? He would rather guess than say “I do not know”. Ask him when the stall 3 doors down opens. He answers at once, smooth and sure. He has never seen their timetable. That confident guess has a name, hallucination. It gets its own lesson later in this course.
Hawkers cannot afford that. A customer asks, any shellfish in the sambal? My niece is allergic. The careless uncle waves it off, no shellfish, no shellfish. The guess sounds like knowledge. The careful uncle asks the auntie who ground the sambal. His answer comes from the tub, not the mouth.
The chef who checks the shelf
You have met that careful uncle already. Ask a bank chatbot about your card. Done properly, it pulls up the actual policy page first. Ask about your balance, and it reads your balance before speaking. Your facts are on the table, so the answer can be checked.
Checking before answering has an industry name, retrieval-augmented generation, RAG for short. Your own facts work the same way. Ah Ma’s secret sambal recipe lives in her head. Paste her version in the chatbot and ask. The model answers from your facts, not from a guess.
Your next prompt, noticed
Your turn. The next prompt you write, notice how the wording changes the answer. Chatbot or search box, send the uncle’s order first, and then the aunty’s. Same model, 2 plates.