Here are the answers to the questions based on the passage provided:

1. **Where does bun bo Hue come from?**
Bun bo Hue comes from Hue, the old capital city of Viet Nam.

2. **What are its main ingredients?**
Its main ingredients are rice vermicelli (bun) and slices of beef.

3. **Where can we find bun bo Hue?**
We can find bun bo Hue nearly everywhere in Viet Nam.

4. **When do people enjoy bun bo Hue?**
People enjoy bun bo Hue for a late-night snack.

5. **How do people make the broth for bun bo Hue?**
To make its broth, people stew beef bones and beef shank with lemongrass, shrimp sauce, sugar, and spicy chili oil.