04Meanwhile, using a mandoline or vegetable peeler, shave the fennel into paper-thin slices. Arrange slices around the edge of a large platter; drizzle with half of the remaining vinaigrette. Add the spinach to bowl with the rest of the vinaigrette and toss. Pile the spinach in the center of platter. While the mushrooms are still warm, slice them thinly on the bias. Arrange on top of the spinach, garnish with cheese shavings and serve immediately.