In a large skillet over medium-high heat add the butter, chopped chicken livers and bay leaves.
Cook the chicken livers until they are brown, then add the chopped sausage meat, stirring to combine.
Add another small knob of butter and add the chopped onion, celery and carrot. Sauté the vegetables for about 4-5 minutes until they are softened.
Add the chopped porcini to the skillet and continue to sauté the mixture for another 4 minutes.
Pour in half a glass of red wine, let it evaporate, then add the tomato passata/cherry tomatoes. Season with salt and pepper to taste.
Cover the skillet and simmer the sauce over a low heat for at least 30 minutes.
Meanwhile, boil a large pot of water for the pasta. Add salt once it starts to boil and bring it back to a boil. Cook the pasta according to the package instructions until al dente. Once the pasta is done, drain it.
Stir in another knob of butter of butter into the sauce then mix in the pasta gently, making sure the it is well-coated.
Plate the pasta and garnish with a sprinkle of fresh parsley and a good amount of grated Grana cheese.