Grilled Portabellas

Yield:	4 Servings
Categories:

4		Medium-sized; (about 12 oz.) fresh Monterey Portabella Mushrooms
2	tb	Butter
2	ts	Minced garlic
2	tb	Balsamic vinegar
1/4	ts	Salt
1/8	ts	Ground black pepper
1	tb	Chopped fresh basil or parsley