The traditional version of French onion soup is not vegan. It is most frequently made with beef broth and topped with melted cheese.  This recipe is a vegan version of a traditional french onion soup.  The plant-based broth gets rich flavor from white miso and Guinness beer and topped with crispy garlic toast croutons.  You can add a slice of vegan cheese to the top if you want, but I generally don’t find they melt or taste all that great and ruin the taste of my vegan french onion soup.