Date vinegar is made from date juice. The juice is allowed to ferment into alcohol. Then, vinegar starter is added and it is allowed to stand to convert into vinegar.
Both red and white date vinegars are available.
Popular in the Middle East, particularly in Iran.
Particularly nice splashed over tomato slices.
The Babylonians were making it as long ago as 5,000 BC. The Romans also made it.