Then stir in the pasta, tomatoes, chicken broth, lemon juice, water, basil, red pepper flakes, salt and salt and pepper as desired. Bring to a boil and continue to stir often, uncovered, for about 8-10 minutes or until the pasta is tender, add more chicken stock as needed, or until most of the liquid has evaporated. Remove from heat, sprinkle cheese on top, and cover for 10 minutes or until cheese is melted and remaining liquid is absorbed. Serve.