All'Amatriciana with Extra Umami

In a deep skillet, heat the oil. Add the guanciale and cook over moderate heat, stirring, until opaque, about 3 minutes. Add the onion, anchovy and garlic and cook over moderately low heat, stirring occasionally, until the onion is softened, about 5 minutes. Add the tomatoes and cook until hot, 2 minutes. In a large pot of salted boiling water, cook the spaghetti until pliable but still hard in the center, about 5 minutes. Drain the pasta, reserving 2 cups of the cooking water. Add the pasta and water to the sauce and cook until the pasta is al dente; add more water if the sauce gets too thick. Remove from the heat and stir in the basil, crushed red pepper and the 1/2 cup of cheese. Season with salt and pepper, transfer to bowls and serve, passing more cheese at the table.