I've been buying balsamic vinegar for a long time. Small expensive bottles that I use sparingly. DOC. Modena. Really good. Usually it wasn't easy to find.
Then a few years ago, it was everywhere and recipes started calling for lots and lots of it. It's in cheap, prepared salad dressings. Marinades. Big bottles of it cost very little. It's not DOC. The labels say "Packed for some company in NJ" or somewhere. Not even Modena, NJ.
What is this stuff?