Now thread 4-5 mushroom pieces onto each skewers. Using a grill pan, grill the mushrooms on medium-high heat until golden brown, about 6-8 minute each side, or until tender. Be sure to press down with the back of a glass, on the skewers, so that the facedown side of the mushrooms gets those beautiful char marks. Repeat this step for the remaining side. Serve the grilled mushrooms with the sriracha dipping sauce and enjoy!