Savannah's Best Marinated Portobello Mushrooms An easy portobello mushroom marinade made with soy, balsamic vinegar, and garlic adds savory flavor to meaty caps. Serve with rice or couscous and a colorful vegetable, or top with your favorite fixings and serve on a burger bun as a vegetarian option. Submitted by MOTTSBELA Updated on May 7, 2026