Place 6 quarts water to boil and add 2 tablespoons salt

In a 12 to 14-inch saute pan, place tomato sauce and tomatoes and bring to a boil. Lower heat to simmer and add basil leaves without stirring. Cook pasta according to package instructions, until just short of "al dente". Drain in colander and toss into pan with tomatoes and basil. Add mozzarella pieces and toss over medium heat until cheese is just melting. Pour into warm bowls and serve immediately.