Trim the ends of the Swiss chard and cut the green leaves off the white stems.
Cut the stems into fine matchsticks and blanch in boiling salted water for 1-2 minutes, or until soft. Drain and set aside.
Blanch the green leaves in boiling salted water for 4-5 minutes, then drain and chop roughly.
Heat the olive oil in a large, heavy-based saucepan, add the onion and garlic and cook gently for 5-6 minutesm, or until soft.
Add the pancetta and sausage meat and cook over a low heat for 20 minutes, then drain off the excess fat.
Add the cream to the sauce and bring to the boil. Stir in the dried chilli and the blanched Swiss chard stalks and their leaves, then cook for 4-5 minutes. Season to taste, with salt and freshly ground black pepper.
Cook the penne in a large pan of boiling water, according to packet instructions, until al dente. Drain, reserving a few spoonfuls of the cooking water.
Add the pasta to the sauce, mix well and add a little of the reserved water if necessary to loosen the sauce.
Cook gently for 2 minutes, then serve with freshly ground black pepper and grated parmesan.