Heat the olive oil in a large saute pan over medium heat. I used my Calphalon Panbecause it has a non-stick surface, it heats evenly, and when I need to the lids are safe to go in the oven.
Add onions, cook on low for 15 minutes, stirring occassionally
Add peppers after the 15 mins, as well as apple cider vinegar and salt and pepper to taste.