Soak plank in enough water to cover for at least one hour. Place a weight on top so the plank remains submerged.

Heat skillet on medium heat and add olive oil.

Add onions and garlic sauce for 3 minutes then add peppers and spinach. Season with spices cooking for a minute or two more.

Add the couscous, mixing well and cook for a minute.

Remove from heat and set aside

Grill the planks uncovered over medium heat 3-5 minutes until planks begin to smoke.

Brush your mushrooms on the bottom with olive oil and only place them on the grill for 2 to 3 minutes just to get grill marks, caps up. Remove and let them cool completely. If moisture appears just pat with a paper towel.

Place mushroom caps on the planks stem side up. Spoon couscous mixture into the mushroom caps. Cover and grill about 15 minutes or until mushrooms are browned and the stuffing is heated through.

Transfer planks with mushrooms to a serving platter. Garnish with fresh herbs