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5 from 30 votes
Hand Dipping Half of a Vegan French Dip Sandwich into a Bowl of Au Jus
Vegan French Dip Sandwiches
Prep Time
10 mins
Cook Time
35 mins
Total Time
45 mins
These vegan French dip sandwiches are made with sautéed portobellos, dressed in spicy horseradish mustard and served ready for dipping in savory vegan au jus.
Course: Sandwich
Cuisine: American
Servings: 2
Calories: 379 kcal
Author: Alissa
  • 2 tbsp. olive oil, divided
  • 1 medium onion sliced into half rings
  • 2 garlic cloves minced
  • 3 portobello mushroom caps, about 20 oz. total, cleaned and sliced into thin strips
  • 1 cup vegetable broth
  • 1 tbsp. soy sauce
  • 1 tbsp. vegan Worcestershire sauce
  • ½ tsp. dried thyme
  • ¼ tsp. liquid smoke, optional, but highly recommended
  • ¼ tsp. black pepper
For Serving
  • 2-6 inch sandwich rolls or baguette sections sliced open
  • horseradish mustard
  1. Coat the bottom of a large skillet with 1 tablespoon of oil and place over medium-low heat. Add onion and toss a few times to coat with oil. Allow to cook until caramelized, about 20 minutes, flipping occasionally. Add garlic and cook about 2 minutes more. Transfer onions and garlic to a plate.
  2. Coat skillet with another tablespoon of oil and raise heat to medium. Add mushroom strips. Avoid overcrowding the skillet. A little overlapping is okay, but work in multiple batches if needed (I needed two), adding a bit of oil between batches if needed. Cook until lightly browned, about 5 minutes. Flip and cook 5 minutes more on opposite sides.
  3. Return onions to skillet and add broth, soy sauce, Worchestershire sauce, thyme, liquid smoke and pepper. Bring to a simmer and allow to cook, stirring occasionally, until liquid is reduced by half, about 5 minutes.
  4. Slather the insides of rolls with horseradish mustard. Use a slotted spoon to remove onions and mushrooms from skillet, pressing lightly to squeeze out any excess juice. Divide onions and mushrooms into rolls. Pour cooking liquid into a small bowl and serve with sandwiches, for dipping.
Nutrition Facts
Vegan French Dip Sandwiches
Amount Per Serving
Calories 379 Calories from Fat 147
% Daily Value*
Fat 16.3g25%
Saturated Fat 2.7g14%
Sodium 1278mg53%
Potassium 668mg19%
Carbohydrates 47.5g16%
Fiber 5g20%
Sugar 7.4g8%
Protein 14.3g29%
Calcium 100mg10%
Iron 3.2mg18%
* Percent Daily Values are based on a 2000 calorie diet.