Food I'm Eating: Sparkling Olives, Anyone? (March 30, 2013)

About a week ago I bottled up the first of two batches of olives I've been making. These are a small variety from a tree that grows in our garden. The second batch is still in the brine stage. They are larger olives from a neighbor's tree that take longer to lose their bitterness. I was looking at the bottled olives yesterday and noticed that the metal lids of the mason jars I used looked somewhat puffy. Suspicious, I opened one and found a fairly vigorous fermentation going on.

Carbonated olives? A bit strange, but the bubbles dissipated overnight (I left the jars open). The olives do have a slight prickle, however. Not unpleasant and the flavor otherwise is great, but I wonder what happened? I did NOT refrigerate the jars after closing them. Perhaps I should have. Perhaps the brine they are packed in was too weak? I decided to add a teaspoon of wine vinegar and a teaspoon of salt to each of the jars and I put them in the refrigerator this time. I hope the fermentation stops. I need an olive guru to tell me what's going on....

In the meantime, I keep eating them.