|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, company, product, or creative work that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
Mustard is a condiment made from the seeds of a mustard plant (white or yellow mustard).
- Mustard on Wikipedia
- Harry Potter and the Philosopher's Stone (video game) (First appearance)