So, my attempts to capture wild yeast seems to have worked, because my ginger beer/wine/whatever is fermenting!

So here is my detailed ginger beer/wine technique, which will hopefully yield something nice!
I will post a full update when I have sampled the first brew!
So, I began by creating a ginger bug.
I did this following Sandor Katz’s method in “Wild Fermentation”. My library (Wellington City Libraries) has an ebook copy of Wild Fermentation available on Overdrive; if your library doesn’t own an e-copy, you can request they buy it (hooray for patron driven acquisition!).

My bug started bubbling after about 2 days, because it’s so hot here. One piece of additional advice I have is to place your bug in some kind of “moat” (a shallow dish of water) to stop ants from getting in! I failed to do so and had a number of ants swimming around a separate container of honey wine (tej – also a recipe from Wild Fermentation) ferment mere minutes after putting it out on the bench 😦 A week later it was covered in mould. But the ants seemed to stay out of the ginger bug, though I didn’t want to risk it so it put it in a moat anyway.
After 3 days, the bug stopped bubbling, and I was concerned it was dead. But, since I had already made the ginger syrup (recipe below) I decided I would try to put it all together anyway and see what happened.
6 days after starting the bug, and 3 days after it had stopped bubbling (despite following the feeding instructions above), I mixed most of the bug with a syrup made from ginger and sugar.
Ginger syrup recipe
I put a large ginger root in the blender with about 2 cups of water.
Then I boiled that with 2 cups of “brown” sugar (see my previous post for an explanation) for 15 minutes.
I let it cool, then strained it and put it in the fridge until I was ready to mix it with the bug.
Sterilising the equipment
I took a large 5 L water bottle and filled it with tap water and 3 tbs bleach.
I let that sit for about 8 hours (it probably doesn’t need to sit that long but I got distracted).
Then I emptied the bottle, rinsed it with filtered water, and tried to let it air dry as best I could.
I cut a little hole in the cap of the water bottle and jammed the airlock bung in it, then jammed the airlock in, and let that sit in a very weak bleach solution for about 1 hour, and then rinsed it with filtered water. The cap and the airlock don’t actually touch your brew so this step isn’t essential, but I thought I might as well sterilise them.
Mixing the bug with the syrup
Then I added the chilled syrup to about 4 L of filtered water and about 9/10ths of the liquid from the ginger bug (which was about 1.25 cups of liquid at that point).
Then, I screwed the lid on the bottle very tightly with the airlock 1/2 full of a bit of filtered water.
(I then started a new ginger bug using the last 10th of the bug liquid and 1 tsp of leftover ginger solids, to which I added 2 tsp of sugar, 2 tsp of fresh ginger, and about 1.5 cups of water in a glass covered with a piece of toilet paper (hobo ginger bug!).)
You can see the photo above of my new ginger bug which seems to be fairly yeasty.
It’s been about 5 days and already the ginger wine/beer is fermenting fairly vigourously. Considering that it only has about 2 cups of sugar (plus any natural sugar from the ginger), in 4 L of liquid, I have no idea how strong this is going to be. I think it will be around 5% based on reading a recipe that used 1.5 cups of sugar and a gallon of water that said it would be 3-4%. I don’t have a hydrometer so I will just have to guess based on how merry I feel after a bottle!
So far… so good, but I am fairly concerned I will get some mould growing on it too, but as of yet I don’t see any signs of mould (fingers crossed!).

It is actually looking like cider in a fermenter at home pitched with commercial yeast.
However because I couldn’t boil the ginger bug (it would kill the wild yeast) and the ginger syrup did sit in the fridge for a day or two before I mixed it with the water… there was lots of potential for contamination happening.
I am leaving Friday for 2 weeks, and hopefully when I come home it will be ready to bottle.
(Update – 6 June, it’s still fermenting away! I have no idea how much longer it will be bubbling for.)
I will know it is ready to bottle when it stops bubbling. My plan for bottling is to use a bunch of these 200 ml plastic bottles I have that I buy soda water in. I figure the soda water is sterile, and as long as I pour it into a glass (don’t put my mouth on the bottle) and then screw the lid back on tightly, I can re-use them without sterilising them. Though if I am concerned I can use the bleach/water solution.
My next decision will be around carbonation and sweetening. I want to add at least a little sugar to each bottle before sealing for carbonation. The yeast will have eaten all the sugar in the fermenter (5 L bottle), but when they get exposed to more they will eat it and turn it into carbonation. However, if you put too much sugar, the bottles could explode because the yeast will just keep eating! So how do you get sweet but sparkling cider?
There are a few easy methods, but I am not sure which is best.
They are
- chilling,
- pasteurisation, or
- sweetening them with a non-caloric sweeter, like Stevia or Xylitol.
You can also do things like “back sweetening” but I don’t fully understand those processes so I can’t speak of how they work, but they seem complicated!
- Artificial sweeteners seem to be either carcinogens (like Aspartame), taste gross (stevia leaf), or really expensive (commercial Stevia sweetners). But, they provide sweetness to the drink without feeding the yeast and getting turned into alcohol.
- The other option of pasteurising involves putting a certain amount of sugar into the bottle that is enough to sweeten it and add carbonation. When the yeasts have eaten enough of the sugar to reach the desired carbonation level, you put the sealed bottles in a bath of water at about 70 C for 10 minutes. The heat kills the yeast and stops them from making more carbonation and exploding the bottle or making more alcohol. ….But I am not sure if plastic bottles can stand 70 C water for 10 minutes. This would work well if I were using glass bottles.
- So the 3rd option is again, adding a certain amount of sugar into the bottle that is enough to sweeten it and add carbonation. However, instead of pasteurising the bottles to kill the yeast when it is sufficiently carbonated, instead you put the bottles in the fridge, where the cold temperature will stop the yeast from carrying on eating the sugars. However, if you have limited fridge space (like I do) this is maybe not the best option, and even at 12 C or whatever temperature your fridge is at, the yeast can still be active, just a lot slower. So, you do have to drink all the ginger beer fairly quickly or you risk explosions…
With all of these methods you have to guess how much sweetness and carbonation you want. A 750 ml beer will usually call for 1/2 tsp pf sugar to be added to each bottle to carbonate it. For the little 250 ml bottles I will be using I have no idea how much sugar to add to carbonate it and sweeten it slightly. I will probably also make a few bottles or a dry ginger beer with no added sweetness, just a pinch of sugar to carbonate.
The bottles should be carbonated after about 2 weeks, so I should have an update here around late June!
There is no homebrew store here so I can’t get no-rinse steriliser, yeast (other than bread yeast), or bottle caps for glass bottles. So, I am making do with what I have available, and harvesting wild yeast! They also don’t really grow any grains locally (other than corn), wheat flour is imported from Barbados, oats from Jamaica, and most other stuff from the USA or Trinidad. Hops would probably grow here, but I don’t know where to get seeds from! Ginger, mango, passionfruit, guava, and banana are plentiful, so I am having fun experimenting with ciders for now. I’d like to do a passionfruit mango guava cider next!
As mentioned above, I will post an update when I have sampled my first brew!