1. combine the eggs, lemon juice and zest and parmesan in a small bowl. Beat with a fork until smooth. Season with plenty of black pepper and set aside.
2. heat the oil and brown the pancetta or bacon. Remove from het. Brown the crumbled sausage meat. Return the pancetta to the pan to keep warm.
3. Meanwhile, cook the pasta until al dente. Drain the pasta but save about 1 cup of the liquid.
4. Combine the pasta nd the sausage mixture. Add some of the saved water and cook for 2 minutes.
5. Remove the pan from the heat and stir in the egg mixture and parsley. The heat will cook the eggs.
6. Serve immediately