Instructions
- Melt butter in a large pot over medium heat. Add sliced onions and cook slowly, stirring occasionally, until caramelized and golden brown (about 30 minutes).
- Add minced garlic; cook 2 minutes more.
- Pour in beef broth and red wine (if using). Add bay leaf and thyme. Season with salt and pepper. Simmer 20-30 minutes.
- Preheat oven to 350°F (175°C). Toast baguette slices until crispy.
- Remove bay leaf from soup. Ladle soup into oven-safe bowls.
- Top with toasted baguette slices and grated cheese.
- Broil until cheese is melted and bubbly (2-3 minutes).
- Carefully remove from oven and let cool slightly before serving.
Keto and Low-Carb Variations
For a keto or low-carb version:
- Substitute onions with thinly sliced cauliflower or zucchini.
- Use vegetable broth instead of beef broth.
- Omit red wine or use a keto-friendly substitute.
- Use low-carb bread or omit bread altogether.
- Use a low-fat, low-carb cheese or dairy-free alternative.
Tips for the Best Soup
- Use sweet onions like Vidalia or Walla Walla for a milder flavor.
- Slow caramelization enhances the flavor.
- Add a splash of sherry or balsamic vinegar during caramelization for extra richness.
- Experiment with different cheeses (cheddar, mozzarella).
- Serve with a side salad or crusty bread.
Frequently Asked Questions
- Can I make it ahead? Yes! Store in the refrigerator for up to 3 days; add bread and cheese before serving.
- Can I freeze it? Freezing is possible, but the onion texture might change. Best enjoyed fresh.
- Can I use vegetable broth? Yes, for a vegetarian option, but the flavor will differ.
- Can I use different cheese? Absolutely! Choose a cheese that melts well.
- Can I use a slow cooker? Yes! Caramelize onions on the stovetop, then transfer to the slow cooker with other ingredients. Cook on low for 6-8 hours or high for 3-4 hours.
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