When my boyfriend and I visited France a few months ago, I noticed that a lot of savory dishes were drizzled with some black-brown colored sauce on top (see picture I took, which is a plain risotto). The sauce tasted fairly sweet and not salty.
My best amateur guess is that this is some sort of reduced sugary balsamic vinegar sauce, but it does not taste acidic at all. Maybe the vinegar evaporated while reducing?
Best Answer
It is most probably crema di balsamico, a quite popular condiment, even often only used for decorative purposes. It can both be used with savory dishes, but also with sweet dishes, as in e.g. ice cream or gelato.
Traditionally, crema di balsamico is made by reducing grape juice and optionally wine to the point where the sugar in the grape juice starts to caramelise and then deglaze the reduction with balsamic vinegar. Convenience products are often pepped with food colouring and thickening agents.