Croatian White Onion Sauce
This is a traditional and delicious Croatian sauce that goes well with all kinds of cooked meat.
Onion can also be cooked in water in microwave on high until tender, about 10 minutes.
Do not omit or substitute wine vinegar with any other type of vinegar. Cooked onions taste somewhat sweet, and wine vinegar gives the sauce just the right taste balance. Alcohol, cider or balsamic vinegar are not a good option because they would completely change the distinctive taste of the sauce.