Clean the mushrooms: Start by removing and discarding the stems. With a paper towel, gently rub off any dirt from the caps. With a small spoon, lightly scrape around the underside of the caps to remove the gills. (The gills are edible but, when you saute them, they’ll turn your recipe darker. If the gills don’t bother you, you can leave them on.)
In a shallow dish, whisk together the marinade ingredients. Choose a dish large enough to hold the mushrooms in a single layer.
Add the mushrooms to the marinade, coating both sides. A quick 10 -minute marinade time is all you need, though you can let them go for up to 30.
Place the mushrooms on the grill, and brush them with the marinade as they cook.
Cook for 3-4 minutes on each side