Spaghetti Carbonara with Spinach serves 4 Whisk eggs in a bowl. Add Parmesan cheese, and black pepper; set aside. Cook spaghetti in a large pot of boiling salted water until almost tender but still firm to bite, stirring occasionally. Add spinach; cook a few seconds longer then drain, reserving 1/4 cup cooking liquid. Whisk hot cooking liquid into egg mixture. Add pasta; toss to coat. Add mixture to skillet with pancetta and toss, adding more cooking liquid by tablespoonfuls if dry.