in the slow caramelization of the onions. Take your time with this step; low and slow is the way to go to achieve that deep, rich flavor.
Customize Your Soup
Feel free to personalize your French onion soup. You can experiment with different types of bread, cheese, or even add herbs like rosemary or a splash of brandy for a gourmet touch. For a heartier version, consider adding mushrooms or cooked beef to your soup.
Make It Ahead of Time
French onion soup can easily be made ahead of time.
