You can roast your own peppers if you like. Place peppers on foil-lined baking sheet. Broil, turning, until lightly charred all over. (Alternatively, preheat grill to high and grease grate well; grill peppers until charred all over.) Place in heatproof bowl; cover with plastic wrap. Let stand for 10 minutes (to make peeling the skins easy). Peel to remove skins.
A SharethePasta.org original recipe.
National Pasta Association Recipe