Mediterranean Portobello Burger is a vegetarian burger option that is packed with flavor and nutrition. The portobello mushroom cap is marinated in a mixture of olive oil, balsamic vinegar, garlic, and herbs, then grilled to perfection. It is served on a toasted bun with fresh vegetables, feta cheese, and a tangy tzatziki sauce. This burger is a delicious and satisfying alternative to traditional beef burgers.