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1. Heat the oil in a large saucepan and fry the bacon until golden over a medium heat. 
2. Slice the onions and garlic and fry until softened. 
3. Add the minced beef and fry until it has browned, breaking down any chunks of meat with a wooden spoon. 
4. Pour in the wine and boil until it has reduced in volume by about a third. 
5. Stir in the tomatoes, drained mushrooms, bay leaves, oregano, thyme and balsamic vinegar.
6. Chop the sun-dried tomatoes before adding them to the pan. 
7. Season well with salt and pepper. 
8. Cover with a lid and simmer the Bolognese sauce over a gentle heat for 1-1½ hours. 
9. Boil the spaghetti in plenty of salted water.
10. Drain and divide between warmed plates. 
11. Scatter a little parmesan over the spaghetti before adding a good ladleful of the Bolognese sauce. 
no estoy tan segura pero mira si te sirve 

oye mepodías decir que es la simetría radial es k no me kedan puntos:)