I admit it. I have a thing for Portobello mushrooms. Portobellos in pasta? Yep, sign me up. Portobellos in salad? Yes, please. Portobellos on the grill and on a bun? You bet, and I’ll show you how to rock it with my not-so-world-famous, but incredibly delicious, marinated and grilled Portobello mushroom burger.