Place the mushrooms in a resealable container or baggie.
Combine the marinade ingredients and add to the container.
Using a spatula, gently turn the mushrooms so they each get well coated in the marinade.
Cover and refrigerate for 30 minutes - 1 hour but no longer.
Fire up your grill for direct and indirect heat cooking over medium-high heat.
Lightly spray a grill basket with non-stick spray or lightly oil your grill grates,
Transfer the mushrooms to the grill and cook for 10-12 minutes or until starting to soften, turning once. Be careful, there will be flare-ups from any marinade dripping into the grill. If the flare-ups are bad, just move the mushrooms to an area of indirect heat until the fire dies down.
Serve hot.
Notes
Add a pinch or two of red pepper flakered pepper flake for a little kick.