Ingredients
Equipment
Method
- Thinly slice the onions.
- Cook onions in butter and olive oil over medium heat for 35 to 45 minutes until deeply caramelized.
- Add garlic and cook for 1 minute.
- Stir in flour and cook for 2 minutes.
- Add broth, water, thyme, bay leaves, salt, pepper, and balsamic vinegar.
- Simmer for 20 minutes.
- Toast baguette slices until golden.
- Ladle soup into oven-safe bowls and top with bread and cheese.
- Broil until cheese is melted and golden.
Notes
For the richest flavor, take your time caramelizing the onions slowly without rushing.
