- Since this depends on the whims and appetites of biological organisms for the chemical processes, it isn’t an exact science.
- The "Mother of vinegar" is sometimes called a SCOBY - Symbiotic Culture of Bacteria and Yeast. It forms a slimy rubbery skin on the surface, which protects the colony from invading microorganisms. Hence the name "Mother". Cute when you think about it. Not so cute to look at.
- There are two ways to make ACV - with pre-fermented, alcoholic apple cider, or with fresh or pasteurized apple cider or juice, as long as they do not contain preservatives. The alcoholic cider takes a little less time, but commercial stuff usually contains sulphites, which are a preservative that is meant to kill vinegar bacteria. I make my own hard cider so that hasn’t been an issue for me.
- If you cannot find anything without sulphites, day or so of prep work will get rid of enough of them to let you use it. The goal is to oxidize the sulphites by exposing the liquid to as much air as possible. Put it in a jar with a couple inches of head space and shake the dickens out of it. Let it sit for a few hours, take the lid off to let a bit of fresh air in, and repeat. 3-5 times ought to be plenty for the amount of ACV a normal human would reasonably make in a single batch.
- The only really important things are to make sure all of your equipment is:
- Clean – as clean as you can reasonably get it - soap and water should be fine
- Non-reactive
- vinegar is acidic. Acid eats things. You will likely regret using your antique copper pot.
- Glass / Stainless steel is best. Plastic is ok for measuring, but use your own discretion. Keep in mind that some plastics will soak up the smell of the vinegar and will stink forever.
- Food poisoning bacteria like botulism and salmonella generally can’t live in the slightly alcoholic, acidic environment of homemade vinegar. Vinegar is also ugly – it’s a colony of germs growing in liquid. HOWEVER, if it smells bad, turns grey, green, or black, or there is something else that seems to tell you that something is wrong, THROW IT AWAY. If you know somebody more experienced than you and you aren’t sure, have them take a look at it. I’ve only had one small batch that I threw out because it smelled like bad breath.
- The very first batch has the biggest risk of contamination. The nasty stuff like molds, fungus, and toxic bacteria really hate the acidity of vinegar, so it is relatively self-sterilizing once its little ecosystem is stable.
- There is a small chance that the vinegar will get contaminated with another type of bacteria that will create acetone. Again, TOSS IT. I've never had this happen, but the smell of acetone is strong enough that you will notice it right away. From what I understand, if it is going to happen, it will be noticeable right away, before there is any vinegar odour. This seems to be more prevalent in beer making than vinegar making, and even then it appears to be extremely rare.
- Unless you have the equipment to properly measure the PH of your vinegar, it is NOT SAFE FOR PICKLING. A quickie place of overnight refrigerator pickles is fine, but PLEASE don't use this to make jars of pickles intended for long-term storage.
- On the other side of the same coin, vinegar is acidic enough to cause skin irritation (probably minor), burn your eyes, and cause nasty gasses when mixed with other household chemicals. Use common sense.
- There is a trace amount of alcohol left in the finished product. By "trace", I mean you probably get more alcohol from strangers wearing too much perfume than you will from the vinegar. See "how it works" for a more in-depth explanation. Plain, unsweetened apple juice is only capable of making about 3-5% alcohol hard cider IF there is no vinegar bacteria present to convert it. I wouldn't leave it where silly children could drink it, but I'd really be more worried about the mess they'd make as they puked up when they got a mouthful of slimy mother and yeast froth. If you are concerned about the trace of alcohol, use sterile flavourless distilled vinegar, and avoid all fermented products, including bread, cheese, yogurt etc... and learn to enjoy living in the sterile bubble.
- Clean glass jar - You can get fancy vinegar jugs for this that allow you to harvest the vinegar without disturbing the mother or any sediment that forms, but it isn’t necessary.
- Mother - can be purchased online, from some brew/wine stores, given to you by a friend, or a cup or so of organic, unpasteurized ACV(Like Braggs, not Heinz)
- A fine cotton cloth or lots of layers of cheesecloth.
- You want to keep dust and “critters” out of your vinegar while allowing it to breathe. I use a clean dishcloth.
- A rubber band or piece of string to hold the cloth on the top of the jar tightly.
- Wash and rinse your hands, jar, anything else that will touch your mix, and the counter in the general area. Yes, again. You don’t want to peek in on your vinegar and find a festering pile of green slime with fur.
- Put your mother of vinegar into the jar.
- Make a lame joke about putting your mother in a jar.
- Pour in your juice/cider. Try to splash it a bit, this will add some extra air to get the culture growing quickly
- Put the cloth over the top and fasten it with an elastic band/piece of string
- Put it in a warm-ish area that is protected from too much light. Apparently vinegar doesn’t like much light. I don’t know why, and I don’t know what happens if it gets too much light. I imagine it screams like a Mogwai, but that could just be me. If you have one of those high cupboards above your fridge that is generally useless, that’s perfect. I keep mine on top of the fridge with a tea towel thrown over it.
- Leave it alone for at least 2-3 weeks. Go ahead and peek now and again to see the mother forming on top.
- If it looks like a big dead jellyfish complete with tentacles, that’s perfect.
- If it looks dry-ish and grainy on top, don’t worry. You have a tough mother who takes her job seriously
- If there’s a tiny bit of pure white little mold on top, it will still be fine.
- If you see green or black mold or mildew, throw it away.
- If you accidentally move the jar and the mother falls in, don’t worry. A new one will grow. You do want to avoid this from happening often, but it’s not a big problem.
- Within 2 or 3 weeks, there should be a mild to moderate vinegar smell.
- By 4-6 weeks, the smell will be getting pretty strong. You can start using it.
Harvesting
There are a couple of options here.
- Some people keep their vinegar, mother and all, in a big jug and just pour out what they need, and top it up regularly with more juice. There are wonderful big glass or ceramic vinegar vessels like this one with a spigot near the bottom that make it so easy to get some vinegar without having the mother trying to get places where you don't want her. That's on my some day list.
- While the vinegar is "brewing", it is fairly easy to "steal" vinegar without distrubing the mother too much by using a turkey baster or syringe to suck some out. A couple tablespoons of this partially finished vinegar is FANTASTIC to add a bit of zing to homemade iced tea or infused water. If you're reading this, I probably don't have to go into the probiotic benefits.
- Strain out most of the vinegar, keep it in the fridge, and start a new batch with the mother. This is what I currently do. As long as you haven't done something silly like stir it with a dirty spoon, you do not have to clean your jar in between batches. I did after my 4th batch just because it was getting crusty bits of dry mother on the sides of the jar and it looked too awful to live with (I grew up in the shiny plastic sterile 80's - I'm slowly getting over it), but there was no sign that anything was wrong. I'm not religious about refrigeration, but since I don't know the PH of my lovely delicious vinegar, I want to avoid mold growth so I try to remember to put it in the fridge when I'm not going to be using it right away. Although the last time I left it out for a couple of days, it started growing a new mother, so I'm pretty sure it probably doesn't really need to be in the fridge.
