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Most French onion soup recipes call for beef stock, but substituting mushroom broth instead creates a surprisingly rich soup, full on flavor - without the meat. Could become a staple recipe in vegetarian or meat-loving households! A long cooking time and savory ingredients mean this soup is pretty darn rich. Add in the toasted baguette slices and all that gooey Gruyere... this soup is definitely the main course. Serve alongside a crisp, green salad.
Ingredients
- salted butter: 2 Tbsp
- olive oil: 2 Tbsp
- red onions: 2 piece (sliced)
- sweet onions: 2 piece (sliced)
- kosher salt: 2 tsp
- white sugar: 1 tsp
- mushroom broth (such as Pacific Foods™): 4 cups
- fino dry sherry: 0.66667 cup
- vegan Worcestershire sauce (such as The Wizard's): 1 Tbsp
- parsley: 2 tsp (dried)
- herbes de Provence: 2 tsp
- bay leaves: 2 piece
- balsamic vinegar: 1 Tbsp
- Parmesan cheese rind: 1 piece (1 ounce piece)
- salt and ground black pepper: (to taste)
- French baguette slices: 8 piece
- Gruyère cheese: 0.75 cup (grated)
- Parmesan cheese: 0.5 cup (grated)
Metric Conversion
Stages of cooking
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Melt butter and olive oil in a pot over medium heat. Add red onions and sweet onions; sprinkle with kosher salt and sugar. Cook, stirring frequently, until onions are very tender and caramelized, about 45 minutes.
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Pour mushroom broth, sherry, Worcestershire sauce, parsley, herbes de Provence, and bay leaves into onion mixture. Bring to a simmer and cook over medium-low heat for 45 to 60 minutes.
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Reduce heat to low and remove bay leaves. Pour balsamic vinegar into soup and adjust seasoning. Mix well.
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Place Parmesan cheese rind in the center of the pot and submerge, but do not stir. Cook soup for an additional 20 minutes.
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Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.
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Arrange bread slices on a baking sheet.
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Broil bread slices in the preheated oven for 2 to 3 minutes per side. Remove from the oven and set aside.
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Carefully remove cheese rind from the pot and discard.
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Fill 4 oven-safe bowls evenly with soup and sprinkle each with a light layer of grated Gruyere cheese and Parmesan cheese. Top each with 2 bread slices and sprinkle each with remaining Gruyere cheese and Parmesan cheese. Place bowls on a baking sheet.
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Broil soup in the preheated oven until cheese is browned and bubbling, 3 to 5 minutes.
