Caramelized onions have a full flavor with sweet and sour notes. They are soft and melt in your mouth; they are a delicious addition to starters, soups, dips, salads, pasta, and sandwiches.
STEP 6: Turn the heat to medium-high, then when the pan is hot add the vinegar.
Stir constantly for 3 minutes to mix the onions with the vinegar, scraping all the brown bits from the pan.