Thinly slice the mushrooms on a mandolin and scatter on a rimmed platter. Cook the bacon in a skillet over medium heat, stirring, until the fat renders and the bacon is crisp, about 8 minutes. Add the vinegar and oil to the skillet and stir. Pour the bacon dressing over the mushrooms and toss. Finish with the arugula, parsley, Parmesan and a few grinds of pepper.
Copyright 2016 Television Food Network, G.P. All rights reserved.