I promise this will be the best portobello burger you've had! Or your money back! Think about this, a big meaty portobello marinated in a balsamic/soy mixture, grilled, then topped with caramelized onions, roasted red pepper and goat cheese, on a warm toasty, whole wheat bun. The sauce is simmered to a reduction and drizzled on! I'm certain it's the best one I've ever had!