Description

Portobello French Dip with Horseradish Aioli is a savory, vegetarian twist on the classic sandwich, featuring juicy roasted mushrooms, melty cheese, and zesty horseradish aioli on a crusty roll, served with a flavorful au jus for dipping.

Ingredients

Units Scale

4 large portobello mushrooms, stems and gills removed
2 tbsp olive oil
1 tbsp balsamic vinegar
1 tsp soy sauce
1/2 tsp garlic powder
Salt and black pepper to taste
4 slices provolone or Swiss cheese
4 hoagie or French rolls
1 tbsp butter
1 small onion, thinly sliced
2 cups vegetable broth
1 tbsp soy sauce (for au jus)
1 tsp Worcestershire sauce (vegetarian if needed)
1/4 cup mayonnaise
1 tbsp prepared horseradish
1 tsp Dijon mustard
1/2 tsp lemon juice
Salt to taste (for aioli)

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Instructions

Preheat oven to 400°F (200°C). In a bowl, whisk together olive oil, balsamic vinegar, soy sauce, garlic powder, salt, and pepper. Brush mixture on both sides of portobello caps.
Place mushrooms on a baking sheet and roast for 20 minutes, flipping halfway through. Add cheese slices on top during the last 2 minutes to melt.
Meanwhile, melt butter in a saucepan over medium heat. Add sliced onions and cook until caramelized, about 10–12 minutes.
In a separate pot, combine vegetable broth, soy sauce, and Worcestershire sauce. Bring to a simmer to make the au jus. Keep warm.
For the horseradish aioli, mix mayonnaise, horseradish, Dijon mustard, lemon juice, and a pinch of salt in a small bowl.
Lightly toast the rolls. Spread horseradish aioli on the cut sides.
Assemble sandwiches with caramelized onions and cheesy portobellos. Serve hot with a small bowl of warm au jus for dipping.

Notes

Use gluten-free rolls and soy sauce to make the recipe gluten-free.
The horseradish aioli can be made a day ahead and stored in the fridge.
Great served with a side salad or roasted potatoes.

Nutrition

Serving Size: 1 sandwich
Calories: 420
Sugar: 5g
Sodium: 750mg
Fat: 22g
Saturated Fat: 6g
Unsaturated Fat: 14g
Trans Fat: 0g
Carbohydrates: 40g
Fiber: 4g
Protein: 13g
Cholesterol: 25mg