Fill a large pot 3/4 of the way with water and place over high heat. Add plenty of salt and bring to a boil. Add the pasta and cook 8 to 10 minutes, until al dente. Drain the pasta and rinse under cold water to cool down.
Put the pasta in a large serving bowl and add the tomatoes, basil, lemon juice, olive oil and salt. Toss well and garnish with fresh basil leaves.