Cut the celery, mushrooms, onion and carrot in small pieces.
Heat up the olive oil and the margarine in a frying pan and cook the vegetables until soft.
Add the bacon and the ground beef and cook on slow heat until the round beef has a golden brown surface.
Add the tomato sauce and the chicken stock and cook another 2 minutes.
Add the white wine, nutmeg, salt and pepper and cook on low heat for 15 minutes.
Prepare the spaghetti according to the instructions on the box.
Place the spaghetti on a plate and pour the bolognese on top, and garnish with the parsley.