Cook pasta according to box directions
Meanwhile, heat oil, over medium, in a large pan
Add red pepper flakes, ½ teaspoon salt, and onion to the pan
Cook, stirring occasionally until the onion is softened, about 5 minutes
Stir in sundried tomatoes and cook for an additional minute
Add garlic to the pan and cook for 30 seconds
Turn burner up to medium-high
Pour sherry in to deglaze the pan, scraping any stuck bits from the bottom of the pan
Cook for about another minute, until little liquid remains
Pour in the crushed or diced tomatoes, deglazing the pan again
Bring the tomatoes to a simmer, then turn heat to low
Partially cover the pan for 25 minutes, stirring every once in a while
Pour cream into the pan and stir until fully mixed in
Continue to cook over low for 10 minutes
Remove the pan from the heat source and add in basil and ½ teaspoon salt
Taste and adjust seasoning
Mix about half of the sauce with the pasta
Serve with extra sauce and a sprinkle of parmesan
Freeze extra sauce for a second round