how long grill portabella mushrooms
Directions See How It's Made. 1  Remove stems of mushrooms and wipe them with a damp cloth. 2  Preheat the broiler or grill. 3  Mix oil, vinegar, herbs and garlic in a bowl.  Brush mushrooms with the 1  mixture. Grill or broil the mushrooms 3-5 minutes per side or until soft and brown.  Submit a Correction.