Baked Ziti with bay

2 tablespoons butter 2 tablespoons olive oil 1 large onion , finely chopped 1/4 lb mushroom , thinly sliced 2 garlic cloves , minced 1 (16 ounce) can tomato[...]

2 tablespoons extra virgin olive oil 4 ounces thinly sliced pancetta , chopped 2 lbs pork shoulder, cut into 1 and 1/4-inch cubes 1 lb hot sausage , casings[...]