Bring a pot of salted water to a boil for the shells. Cook pasta according to package directions; drain and set aside. Heat oil in a large saute pan over medium. Add onion, pepper flakes, and black pepper; cook 3 minutes, or until onion is translucent. Add tomato paste and garlic; saute for 1 minute. Stir in tomatoes and vinegar. Bring to a boil and cook, uncovered, for 5 minutes, or until thickened. Add cream, simmer for 1 minute, then stir in cheese, basil, cooked shells, and salt. Serve immediately. i Creamy Gorgonzola is a rich Italian blue cheese with a tangy flavor and a soft texture.