Place all vegetables in a microwave safe dish and microwave for two minutes to soften them up a tad before adding them to the sauce mixture. (chronicallyvintage.com)
However, you don't need to roast your peppers before adding them to the sauce if you'd like to save some time and effort. (cravingsustenance.com)
I chose to add them to my sauce for that crunch factor. (bakeatmidnite.com)