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.
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.
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.