How to Make It
In a large skillet, heat 3 tablespoons of olive oil. Add the mushrooms, season with salt and pepper and cook over high heat, stirring occasionally, until golden, 7 to 8 minutes. Transfer to a plate and let cool slightly.
In a large bowl, whisk the remaining 3 tablespoons of olive oil with the lemon juice and season with salt and pepper. Add the celery, mushrooms and cheese shavings and toss gently. Serve right away.