If you are using wooden skewers then soak them in cold water for atleast 30 minutes.
Mix together the wet and dry jerk rub along with the olive oil and set aside.
Separate the mushroom from their clusters and use kitchen scissors to cut off the long stems, you won't need those.
Thread the mushrooms onto the skewer(s) pack each one tightly as the mushrooms will loose some volume as it cooks plus this will help to keep them in place.
Coat the mushrooms with the jerk seasoning using a pastry brush.
Carefully place the skewers on a grill/broiler rack (have a baking tray underneath to catch the drippings.
Heat the broiler (grill) on medium-high heat.
Place the rack under the heating element.
The cooking time will take about 8-15 minutes because the water needs to be cooked out before they brown so patience is needed.
Carefully flip the skewers and keep a watchful eye on them until they brown (not burn).
Brush the skewers with some of the leftover jerk seasoning towards the end.