Boil the pasta in a large pot of salted water. Drain and keep warm.

Fry the bacon until just cooked. Add the mushrooms and fry until they have browned and the bacon starts to crisp

Reduce the heat and add the cream a little at a time, stirring as it thickens. Stir in the stock and pesto and heat through.

Add the bacon sauce and the Parmesan to the pasta and toss to combine. You can add extra cream if you want to