For a deeper flavor, consider caramelizing the onions for a longer period, up to 20-30 minutes, until they are a rich golden brown. A splash of sherry vinegar at the end of the simmering process can add a delightful tang to the soup. If you prefer a stronger cheese flavor, Gruyere or provolone can be substituted for mozzarella.
Angelita Lebsack
Mar 28, 2025The recipe was easy to follow, and the soup was delicious. I will be making it again soon.
Raphaelle Nitzsche
Feb 10, 2025This soup was a hit! The caramelized onions made all the difference.
Therese Kemmer
Dec 17, 2024I used Gruyere cheese and it was amazing. Definitely a keeper!