It looks like my stout vinegar project is a success. Over the past several weeks I have left my vinegar barrels alone and today I had the opportunity to check on the vinegars growth. I began by tweaking our tequila vinegar with a tequila-water-agave syrup supplement. Our port and maple vinegars are happily aging in their respective barrels. I emptied a few unfinished bottles of wine into our every wine vinegar and then put some cider vinegar in the smoker for another project. I almost forgot about the gallons of stout vinegar I had started several weeks ago until I knocked the glass barrel which holds our small batch of stout vinegar. Something moved in the barrel. I pulled the vinegar out into the kitchen and removed the cheese cloth cover. There was something thick floating on the top of the stout. Look what I found. mother. The stout had been converted into vinegar. I then ran back to check the five gallon buckets I had also set up to make stout vinegar. Three containers, three mothers, plenty of rich decadent stout vinegar. Now I need to find the right bottle to put all this vinegar into. And there is also all the opportunities to use this vinegar. I may start by making a stout-ketchup sauce. We shall see.