Balsamic vinegar is the eighth wonder of the world. It's vinegar; it's salad dressing. But it's good on ice cream. Makes the mind boggle. But to real foodies it makes sense: Balsamic vinegar is a combination of white grape juice and vinegar that is aged like wine in a series of wooden barrels until this rich and aromatic ingredient is produced. Learn about the fascinating aging process of balsamic vinegar, plus how to choose a bottle at any price range and for any dish during Whole Foods Market's Know-It-All Series: Balsamic Vinegar and Olive Oil at the Richardson location at 60 Dal-Rich Village near Coit and Belt Line roads. The in-depth discussion hosted by food expert and Whole Foods' grocery team leader Richard Roden also tackles olive oil, which can be purchased in generic bottles at any grocery store, which you'll probably never do after Roden sets you on the right path. The class is at 7 p.m.; admission is free. Call 972-699-8075.