Cut the bacon into strips. Chop the onion into small cubes. Prepare the pasta according to the instructions on the packet.
Fry the bacon in a high pan until crispy. When the bacon is getting crispy, add the onions and fry them with them. When it is translucent and the bacon is really nice and crispy, add the mustard and briefly toast. Deglaze with a good sip of the granulated stock so that the bottom of the pan is covered. Simmer briefly and add the cream. After reducing it briefly, work in the ricotta with the whisk and finally season with a little pepper.
Add the cooked tortellini to the sauce. Cover with the mozzarella and bake in a hot oven at 230 ° C for about 10 to 15 minutes.