1Prepare grill for direct med. heat
Clean mushroom caps and remove stem and gills
2Brush mushrooms with Mojo (both sides)
Slice avocado lengthwise,remove pit and lightly coat flesh with veg. oil.
Slice two 1/4" slices from center of onion and lightly coat with veg. oil
3Grill avocado and onion over direct heat till just soft, remove to side to keep warm.
Grill shrooms gill side down for 4 minutes, turn and grill for another 4 minutes or just untill the shrooms start to release their moisture.
Add cheese to caps, (if using) close grill lid to melt cheese, remove
4Slice roll, add portabellas, remove avocado skin and gently flaten the flesh with the flat edge of a large knife, use same knife to scrap under avocado and add desired amount atop shrooms. Add grilled sliced onion, sliced tomatoe, cilantro and salt and pepper.