Rinse the mushrooms thoroughly under lukewarm water. Use a soft brush or a damp paper towel to gently rub any dirt or residue off of the caps. Pat dry with a kitchen towel or paper towels.
Transfer the mushrooms to a casserole dish or a sealable container. Pour in the marinade. Spoon the marinade over the mushrooms so that they are all well coated. Marinate mushrooms for 15-20 minutes.
Fire up your outdoor grill. For a gas grill, preheat to medium heat (350 to 400 degrees Fahrenheit). For a charcoal grill, preheat the goals for 20 minutes prior to grilling.