Jump to Recipe Print Recipe

Get Your Grill On!

Barbecue Sauces come in all kinds of flavors, colors, and types. Everyone knows the thick, sweet sauces found on the shelves of most grocery stores However, there is so much more to barbecue than these bottled condiments.

Grilled Portobello with Basil Mayonnaise Sandwich

Print Recipe Jump to Recipe
Created by: Rotorwife
This sandwich is sure to please vegetarians and meat-lovers alike! Grilled portobello mushrooms are smothered in a flavorful basil mayonnaise, then placed on top of a toasted bun.
5 from 2 votes
Prep Time 10 minutes
Cook Time 10 minutes
Additional 5 minutes
Total Time 25 minutes
SERVINGS 6 People

Ingredients
  

  • 1/3 cup  balsamic vinegar
  • 1/4 cup  olive oil
  • 1 tablespoon  minced garlic
  • portobello mushroom caps
  • 1/2 cup  mayonnaise
  • 1 tablespoon  Dijon mustard
  • 1 teaspoon  lemon juice
  • 2 tablespoons  chopped fresh basil
  • 6  kaiser rolls, split, toasted
  • 1 tablespoon  butter
  • 6 leaves lettuce
  • 6 tomato slices

Instructions
 

  • Preheat an outdoor grill for medium heat, and lightly oil the grate. Whisk together the balsamic vinegar, olive oil, and garlic in a small bowl.
  • Arrange the portobello mushrooms gill-side up on a tray or baking sheet. Brush the mushrooms with some of the vinegar mixture, and allow to marinate for 3 to 5 minutes.
  • Place the marinated mushrooms on the preheated grill, gill-side down. Grill mushrooms until tender, brushing both sides of the mushrooms with the remaining marinade, about 4 minutes on each side.
  • Mix the mayonnaise, dijon mustard, lemon juice, and basil in a small bowl. Butter the toasted kaiser rolls, then spread with the mayonnaise mixture. Divide the mushrooms, lettuce, and tomato slices evenly to make 6 sandwiches.

Nutrition

Serving: 6gCalories: 411.9kcalCarbohydrates: 35.6gProtein: 8.3gFat: 27.7gSaturated Fat: 4.9gCholesterol: 12.1mgSodium: 417.4mgPotassium: 919mgFiber: 4.3gSugar: 8.2gVitamin A: 1922.5IUVitamin C: 18.5mgCalcium: 73mgIron: 2.7mg
American Barbecue Association

FEATURED RECIPES, EXCLUSIVES & MORE!

Shop BBQ

Find the best BBQ tools, grills, merchandise and more. Plus shop for some great BBQ swag!

Reviews

American Barbecue Association
© 2026 American Barbecue Association. All Rights Reserved
Scroll to Top

Become a Member of the
American Barbecue Association!

Exclusive access to recipes, events, and more!