Clean the porcini mushrooms (do not wash!) And cut them into slices.
Rub a deep pan with the peeled clove of garlic. Pour in olive oil and sweat the finely chopped shallots in it. Also dice the bacon and add the porcini mushrooms and a little butter and fry until the mushrooms are slightly browned and the water has evaporated. Season with salt and pepper to taste. Fry the sage cut into thin strips and add the cream to everything. Simmer a little until the sauce has a slightly creamy consistency.
In the meantime, cook spaghetti or tagliatelle and arrange everything together.