I haven't had much trouble finding info on why fermented vegetables are good for you and how to make them yourself, but advice on buying them pre-made has been harder to find.

I picked up a jar of A-Grosik White Cabbage Salad at Whole Foods because it looked so delicious. It's imported from Poland, but obviously intended for export because the label is all in English. The ingredients are cabbage, carrot, onion, red pepper, cucumber, vinegar, water, salt, sugar and spices, no preservatives. Is it even fermented? Is it any better for you than Del Monte sauerkraut in a can? How can I tell by reading a label whether I'm getting something with any value as a probiotic?