What is olive vegetable? I checked with Wikipedia and sadly, he does not have a definition for it. I remember mom laying out this bottle of black stuff on the table whenever we were having congee and eating it as an accompaniment. That was my acknowledge about it. Fast forward 20 years, I reunited with OV when I was having this wonderful plate of stir-fried french beans with minced meat. The aroma coming from that dish was absolutely heavenly. Don't let the name fool you. It is not made from olive leaves. Rather, it is made with a combination of olives, mustard green leaves, oil and salt marinated for a long time. They are available in any supermarket here and if you are in overseas, any Chinese grocer.