Authentic carbonara, lactose-free and mushrooms

We put in boiling water. And add the pasta and salt.

We put the onion to poach with the olive oil, when it is transparent add the bacon over high heat, when it browns throw the oil it releases, add the mushrooms and lower the heat to put the mushrooms.

With a skimmer, remove the pasta and add it to the pan, add a spoon or ladleful of the pasta broth, turn off the heat and add the egg yolk and cheese.

If desired, more cheese can be added when plating.