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Vegan French Onion Soup Recipe

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4.3 from 2 reviews

This easy Vegan French Onion Soup features caramelized yellow onions cooked with garlic and thyme in a rich vegetable broth, enhanced with sherry vinegar and vegan Worcestershire sauce. Topped with toasted baguette slices and melted vegan provolone and parmesan, it makes for a cozy, sophisticated starter or side dish that's entirely plant-based and full of deep, savory flavors.

  • Author: Zara
  • Prep Time: 10 minutes
  • Cook Time: 45 minutes
  • Total Time: 55 minutes
  • Yield: 6 servings
  • Category: Soup
  • Method: Stovetop
  • Cuisine: French
  • Diet: Vegan

Ingredients

Soup

  • 4 large yellow onions
  • ½ cup unsalted plant-based butter
  • 5 cups water
  • 3 vegetable bouillon cubes
  • 3 tablespoons sherry vinegar
  • 1 tablespoon vegan Worcestershire sauce
  • 1 teaspoon dried thyme
  • ½ teaspoon salt
  • 1 teaspoon black pepper

Toppings

  • 1 baguette or one loaf of French bread, sliced
  • 6 slices vegan provolone cheese
  • 6 tablespoons grated vegan parmesan cheese

Instructions

  1. Slice Onions Thinly: Using a mandoline or a sharp knife, slice the yellow onions very thinly and set aside on a cutting board.
  2. Caramelize Onions: In a large pot over medium heat, melt the vegan butter and let it heat for 1 minute. Add the sliced onions, stir, cover with a lid, reduce heat to medium-low, and cook for 10 minutes, stirring regularly to prevent burning. Onions will soften and start to caramelize. If needed, add a splash of water to prevent sticking or browning too quickly.
  3. Add Broth Ingredients and Simmer: After caramelizing, add water, vegetable bouillon cubes, sherry vinegar, vegan Worcestershire sauce, dried thyme, salt, and black pepper to the pot. Stir well, cover with the lid, raise heat to medium-high to bring to a boil, then reduce to a simmer. Let it cook uncovered for 30 minutes to develop flavor.
  4. Prepare for Broiling: Preheat your oven's broiler for 5 minutes. Carefully ladle the soup into individual oven-safe bowls placed on a baking sheet.
  5. Add Bread and Cheese: Place a slice of baguette on top of each soup bowl. Top each bread slice with one slice of vegan provolone cheese and 1 tablespoon of grated vegan parmesan cheese.
  6. Broil to Melt Cheese: Place the baking sheet on the top oven rack and broil for 1 minute. Check the cheese melting progress and broil for an additional 1 to 2 minutes until the vegan provolone is fully melted and slightly bubbly.
  7. Serve: Carefully remove the hot bowls from the oven, place on a cooling rack, garnish with some extra black pepper if desired, and serve immediately for a comforting and flavorful vegan soup.

Notes

  • Quick prep: Use a mandoline slicer to cut onions evenly and quickly.
  • For richer flavor: Extend caramelizing onions to 45-60 minutes until deeply golden and sweet.
  • To thicken soup: Stir in 2-3 tablespoons of flour during caramelization or add a cornstarch slurry near the end of cooking.
  • To avoid soggy bread: Lightly toast the baguette slices before placing them on the soup.
  • Recommended vegan brands: 365 Worcestershire sauce, Earth Balance buttery spread, Better Than Bouillon no-chicken, Violife provolone cheese.