Grilled Portobello Mushrooms are large, meaty mushrooms soaked in a tasty marinade, then grilled to golden brown perfection. An easy low carb, vegan side dish or main dish option that’s perfect for summertime! Not only do these make an awesome, easy side dish to go alongside steak, chicken or fish, but they’re great as a vegetarian main served with summer salads. The mushrooms are marinated in the most delicious sauce, and they get almost caramelized by the heat of the grill. So good!