Don’t confuse hoisin sauce with fish sauce.
Hoisin sauce is vegan, while fish sauce is of course not vegan.
Hoisin sauce is typically made with soybeans and a collection of spices.
This may include:
- Xanthan Gum
I’ve yet to come across a non-vegan hoisin sauce, but let me know if you have.
You might notice that some hoisin sauces are labelled “vegetarian” while some aren’t, particularly in Asian countries.
It has to do with garlic and onion not being suitable for strict vegetarian buddhists. Don’t be concerned by it, you can get either kind as a vegan and be fine.