Heat a 14 inch saute pan over high heat. Add the olive oil and when it is near to smoking add the mucshrooms and the beef. Season them with salt and pepper. Add the shallot and the garlic. The beef and mushrooms should be browning a bit. Add the demi-glace and the peas. Bring to a boil, reduce the heat and let it simmer until the pasta is ready.
Drop the pasta into the water and cook for about 2 minutes. Drain and toss the pasta with the sauce. Stir in the parsley and plate. Top with cheese and have extra cheese at the table.