by Nanette Geller Pasta Alla Norma is a classic Sicilian eggplant and tomato dish created in the 19th century. It was supposedly named in honor of  the Sicilian composer Vincenzo Bellini's enormously popular opera "Norma."  Although sometimes made with spaghetti or other pastas, it is most commonly made with penne. American recipes sometimes call for fresh ricotta, a soft, creamy product which