Cook pasta al dente
Finely chop red onions and marinade in Italian dressing for a more subtle flavor
Chop up all remaining ingredients in similar sizes.
Drain and rinse pasta
Submerge colander of pasta in a bowl filled with ice water to stop the cooking process
Combine the cooled pasta with all chopped up ingredients and red onion marinade.
Add additional dressing (to preference) and toss.
Refrigerate for 20 minutes prior to serving. Can be refrigerated for up to 5 days.