4 ounces guanciale, cut into 1/4-inch cubes
1 tablespoon olive oil
1 teaspoon ground black pepper, or to taste
2 eggs
3 tablespoons grated Parmigiano-Reggiano cheese
3 tablespoons grated Pecorino Romano cheese
1 teaspoon ground black pepper, or to taste
6 ounces spaghetti
1 cup reserved pasta water
3 tablespoons grated Parmigiano-Reggiano cheese
3 tablespoons grated Pecorino Romano cheese

You can substitute pancetta for the guanciale. Or in a pinch, use bacon