As a hotel waiter, the guest asked me if there were any special dishes or non-spicy dishes in our store, or what was delicious, and I didn't know how to answer.
Special dishes are easy to remember. There should be posters in the restaurant. If a dish is delicious, everyone has different tastes. There is no uniform standard for this. You can answer: it depends on what flavor you like. You can look at the menu.
Usually learn from other waiters. If not, ask the foreman. Newcomers will soon be familiar with what they say.