3 portobello burger with topping Recipes

portobello mushroom, stem removed, olive oil, dried oregano, salt and pepper, to taste, plum tomato, chopped, pitted green olives, chopped, mayonnaise, multigrain hamburger bun, split and toasted, lettuce leaf, provolone cheese

roma (plum) tomatoes, diced, chopped fresh basil, shredded parmesan cheese, balsamic vinegar, garlic, minced, olive oil, kosher salt, ground black pepper, portobello mushroom caps, stems removed, shredded horseradish cheddar cheese , or to taste (optional), kaiser rolls, split