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Bring 6 quarts water to boil and add 2 tablespoons salt.
In a 12 to 14 inch sauce pan, heat olive oil, onion and celery over medium high heat until soft, about 8 to 10 minutes. Add mushrooms and cook until sweated, about 8 to 10 minutes. Add tomato sauce and bring to a boil. Meanwhile, drop pasta into boiling water and cook 1 minute until soft. Drain well and toss into pan with mushrooms. Cook until wellcoated. Add parsley, toss into warm platter and serve.
Dress arugula with extra virgin olive oil, lemon and salt and divide among each plate. Shave Parmigiano over each plate and then blanket with truffles or porcini, each sliced paper thin. Drizzle with remaining oil and serve.