Grilled Portabella Mushrooms - cooking recipe

Ingredients

4 large fresh portabella mushroom caps
1/4 cup balsamic vinegar
2 tablespoons shallots (minced) or 2 tablespoons red onions (minced)
3 fresh garlic cloves (chopped)
2 tablespoons olive oil
1 tablespoon fresh rosemary (chopped)
1 tablespoon thyme (chopped)
salt and pepper, to taste
shaved fresh parmesan cheese, for garnish (optional)

Preparation

Place mushrooms in a quart size zip lock bag combine remaining ingredients except cheese and pour over the top of the mushrooms.
Marinate for 1-2 hours, tossing once or twice.
Remove from marinade and cook on hot grill for 3 minutes on each side watching carefully not to burn.
Serve as a side dish, main course, or on a roll (burger substitute).
Topped with shaved cheese.