Grilled Portobello with Basil Mayonnaise Sandwich

Grilled portobello sandwich with lettuce, tomato, and basil mayo on a bulky kaiser roll — perfect for lunch on a summer day.

• Preparation Time: 20 mins
• Cooking Time: 10 mins
• Total Time: 30 mins
• Calories: 412 Calories

Ingredients

• 1 teaspoon lemon juice
• 2 tablespoons chopped fresh basil
• 1 tablespoon minced garlic
• 6 leaves lettuce
• 1 tablespoon Dijon mustard
• 6 tomato slices
• 6 portobello mushroom caps
• 1 tablespoon butter, softened, or as needed
• 6 kaiser rolls, split, toasted
• 0.25 cup olive oil
• 0.5 cup mayonnaise
• 0.33333334326744 cup balsamic vinegar

Recipe Instructions

Step 1

Preheat an outdoor grill for medium heat and lightly oil the grate.

Step 2

Whisk vinegar, oil, and garlic together in a small bowl.

Step 3

Arrange mushrooms on a baking sheet with the gills facing up; brush with about 2/3 of the marinade and let sit for 3 to 5 minutes.

Step 4

Transfer mushrooms to the preheated grill with the gills facing down; grill, basting occasionally with remaining marinade, until tender, about 4 minutes per side.

Step 5

While the mushrooms are cooking, mix mayonnaise, basil, Dijon, and lemon juice together in a small bowl. Butter toasted rolls, then spread with mayonnaise mixture.

Step 6

Remove mushrooms from the grill and place on bottom buns. Top with lettuce, tomatoes, and top buns.