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Catching wild yeast and making sourdough

Catching wild yeast and making sourdough
Baking bread is a wonderful, delicious hobby. Bread can be as complex or as simple as you want. This instructable is about making simple but time consuming bread.

To make sourdough you will need a sourdough starter, which is essentially flour and water mixed and left to gather bacteria. Yes, sourdough is sour because of bacteria, which in turn eat away at the starter and produce waste (lactic acid). Yeast itself will produce alcohol when left to its own devices, which is why it is used to ferment things such as...well, alcohol. The bacteria eat that too, leaving behind what essentially amounts to vinegar. Neat.
Note: Thank you for the clarification, atomictesting. Fixed for correctness.

A fair warning before we get started: Completing this instructable can take anywhere from one week to several months, depending on the amount of time you are willing to spend and how many times you accidentally screw up.

I will not be using active-dry or rapid rise yeast at any point during this instructable at all.

Why wild yeast?
Why not? It's neat and, given the right about of time, your sourdough will take on its own distinct flour not quite like any other starter.

Why is it sour?
Bacteria and wild yeast. When you let the starter and the bread sit as long as you will be (days and weeks) it takes on that distinctive sour flavor.

How long does this take?
Forever. It's an ongoing process.

How much experience do you have?
Not a lot. I'm a hobbyist. I'm very open to suggestions or corrections if someone out there knows something that I don't know.
 
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Step 1Starting the Starter

Starting the Starter
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The first, most important thing to remember when making your first sourdough starter: It takes a while, it is going to smell weird, and it is going to demand your attention and love.

Other than that, a lot of this is just trial and error. If you don't like your result, scrap it and start over.

For this step you will need the following ingredients:

- A glass or tupperware container that can be sealed.
- White (standard, all purpose or bread) flour. Do not use self-rising flour. Buy the 5lbs all-purpose.
- Whole-grain wheat flour. Same rules apply as with the white flour.
- Warm, clean water (90-115 degrees Fahrenheit)
- A clean measuring cup.
- Something you can stir with. Non-metal spatulas work just dandy, and are preferred.
- Time. You will need to deal with this sucker once every 12 hours or so.
- Heat. Room temperature is great. The starter must be stored at room temperature (or close).

First things first. Pick a time when you will be available every day to start, and be sure that you will be available every day 12 hours later as well. I started mine at 7p.m. because I knew I would be awake at 7a.m. and home by 7p.m. Once you pick your time, gather your supplies.

This first step will be quick and painless.

Put 1/4c (cup) each of the white and wheat flours into your container. That is 1/2c total flour.*

*You do not have to use wheat flour. In fact, you can use only white flour or only wheat flour. It's a matter of taste. I like to add a little wheat flour to all of my bread, but that's just me. Maybe you don't.

Now, add 1/4c clean, warm water.

Stir 'em up. The water and flour should form a thick, sticky ball. Try to get all of the flour in there. Don't worry about it sticking to the walls. It's going to stick to everything.

Once you're happy, close it up and set it somewhere warm.

Walk away. For 12 hours. You can look, but don't touch.
Leave it alone.
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62 comments
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Feb 24, 2012. 3:58 AMtremend says:
I keep my sour in a plastic bowl with a lid lightly placed on top - not 'clicked' on.

I have had a few flies buzzing around lately and today, I found a fly in the sour!

When I did click the lid on it suddenly blew off one night (scared my wife)!

Will baking kill anything nasty from the flies or must I throw it all away?
Feb 15, 2012. 10:43 AMorosiriley says:
Thank you for the instructions, it worked! We live in the highland tropical rainforest or Costa Rica where our climate is the same ever day with highs of 72° and every night lows of 60°. It took about a week to collect enough wild yeast, but my "started" is nice and bubbly.
We are making low carb, whole wheat bread using Tuscan farro.
The results have exceeding expectations.
Dec 29, 2011. 7:41 PMPurpleKat says:
Just wanted to leave a comment to let you know that I've still got my starter going, and it's churning out some great bread. I have two batches of dough going right now, one of them for loaves tomorrow night with carrot and ginger soup (YUM!) and one for pizza the night after. I gave out jars of starter as Christmas presents this year, and they were a hit. :)

For anyone intimidated about trying this -- don't be. It's easy, and very forgiving. I neglected my "pet blob" during November, and it bounced right back from the missed feedings.
Sep 12, 2011. 3:55 PMPurpleKat says:
Thank you so much for this! I've seen sourdough starter recipes before, but nothing as hardcore and awesome as this. :) I'm looking forward to some wonderful sourdough!

Has anyone tried this starter with a bread machine, yet? I'm a big wimp, and I don't think my arms would survive the kneading process of making bread the hard way.
Sep 12, 2009. 2:34 PMadnimo says:
Yum! I've never had sour bread before, so I'll be definitely trying this out. Is there a way to avoid having to buy yeast altogether and being able to make things such as pizza, bread, etc?. One of my problems is that my yeast goes bad (they only sell the packaged, powder one which I personally dislike and the little blocks of yeast, which are way too big for my needs and they always end up going bad and into the trash bin...) Any ideas?
Sep 12, 2011. 3:43 PMPurpleKat says:
Hey, if you want your yeast to keep forever, get the dry yeast in those little glass jars and keep it in the fridge. My favorite, when I can get my hands on it, is Red Star. If you can't find it locally, you could probably order it online.

I had a jar of yeast that I bought right before I moved to a place where the kitchen was too small for my bread machine. Used maybe a couple teaspoons of the yeast. It sat in the fridge for, I kid you not, over two years. Then I moved to a larger place and decided to make bread again and -- the yeast was fine. Worked perfectly.
Dec 25, 2010. 6:28 PMchello2k9 says:
sourdough can be used for pizza, and this is obviously a bread dough..I've never heard of sourdough bagels though, that might be good, and different
Sep 25, 2009. 7:56 PMjabapyth says:
I always keep my yeast in the freezer, and it stays good for...a really long time.
Aug 28, 2011. 6:31 PMtea_lover says:
Just wanted to leave a comment saying thanks so much for this awesome instructable! I've had my starter going for a few months now and I love it so so so much. I've been feeding my starter 1:1 ratio of flour/water though because I didn't think the mix was runny enough. Thanks again
Jun 8, 2011. 7:16 AMCakadaOokamiko says:
Thanks for having a simple recipe. I tried googling other recipes, but they had things like coconut oil, milk, eggs, dry yeast, etc.
May 12, 2011. 10:30 AMBen Mighall says:
Also, how often and how do you feed it after you are off the "once-a-week" plan?
May 12, 2011. 10:27 AMBen Mighall says:
Do you need to leave the lid open or do you leave it closed?
Apr 24, 2011. 10:39 PMDavid_huai says:
I am from China. The process is almost same for us to make the yeast for Chinese bread.
Dec 13, 2009. 2:29 PMKiulkaitis says:
Hi!, I'm from Venezuela and this is the first time that I've heard of sourdough.  So I try this instructable from the beggining and I've just made my first one.  I really like the taste but since I've never try it before I really don't know if this is the real thing.  So please if you can describe the flavor of the sourdough It'll be really helpful for me.  Thank you!
Dec 25, 2010. 6:27 PMchello2k9 says:
consider trying other sourdough recipes on here and comparing
Apr 26, 2010. 6:34 AMPazzerz says:
Your ARE tasting it.  Sourdough got its name from the fact that the dough was allowed to sour when the bakers didn't want to throw out the original dough and kept making bread with old dough.  Correct me, someone, if I'm wrong but I think it started around the San Francisco area in California about the time of the gold rush.
Jun 14, 2010. 9:28 AMhannaile says:
Oh, sourdough has been around for a lot longer than that. I've read somewhere that it was used some 6000 years ago in Egypt. Modern yeast that you buy in the store has only been around since 1850 or so. Another alternative way of making bread rise wich was used in the middle ages is barm, a bipruduct when fermenting to get alcohol. There is however a strain af lactobacillus called sanfranciscensis!
Oct 28, 2010. 9:00 AMblauschmetterling says:
Mine doubled once but hasn't doubled again since then. Any idea what might be wrong?
Nov 22, 2010. 10:30 PMzexy says:
If you've been feeding it once a day, try adding a pinch or two of sugar. If there's any yeasties moving around down there, maybe they just got a little sluggish and the sugar will help to kick them into high gear again.
Oct 18, 2010. 8:42 PMDavidLaPlante says:
I made this movie on how to make sourdough although I don't exactly understand how yeast exactly worksbut I'm able to get it to activate it every time with just water and flour.
http://www.youtube.com/watch?v=MNNwzt8eoTQ
Oct 10, 2010. 1:05 PMrmginstructables says:
Should you close the container, or leave it a little open when you place it in the fridge?
Thanks
Oct 18, 2010. 8:40 PMDavidLaPlante says:
You can do either I prefer to seal it with air inside.
Sep 19, 2010. 9:27 AMpcline2 says:
First, very nice 'able. i am in the middle of making my first batch. i was wondering about the use of metal in the making of the bread. i have a stand mixer with a dough hook but both are metal. i was wondering if using that would in any way effect the yeast/bacteria. using the stand mixer would make it exponentially easier.
Apr 25, 2010. 6:23 PMtehkryptonite says:
I'm a bit confused about where the yeast would come from.  Since no yeast cultures were added, do we assume that yeast would drop from the environment to the water-flour mixture in the very first step?

What if I can obtain a pure yeast culture?  I work in a genetics lab where we use yeast (Saccharomyces cerevisiae).  If I can grow a pure yeast culture on a agar medium, could I take that culture and apply it directly to the flour?  (Would this even be safe?  I think there's only one single type of yeast to make bread/beer, and that's Saccharomyces cerevisiae.  Are there even strains of yeast that may be infectious?

If I can use a pure culture from my lab, how much of the yeast should I place into the dough?
Jul 2, 2010. 10:01 AMvalleycrosser says:
If you're going to use anything from a lab to eat, you should be cautious and make sure you're using something safe to eat.
May 1, 2010. 8:50 PMmarnieC says:
if you added yeast you've cultivated then it wouldnt be true sourdough.  if you are uncertain about the yeast getting in, i read a suggestion that you dip a red cabbage leaf in the cold water you are going to use.  The white film on the leaf is natural yeast
May 31, 2010. 5:37 AMkameraman0 says:
Once you get a good starter and it gets big you can seperate it in two and store half and keep feeding the other half. Continuous supply with out having to restart!
May 9, 2010. 1:15 PMlonghairedartist says:
Does hooch have any use as a byproduct? I mean for example when you make biodeisel you end up with a good amount of degreaser, excellent for cleaning mechanics hands.
Would hooch benefit or harm a compost pile? Should it go down my waste drain or can it go into the greywater system?
I'm imagining that the stuff may create a stronger presence of yeast in my patio garden, which may infiltrate the air and make subsequent sourdough starters even more flavorful and localized...
I'm reading on the sourdough wiki that unwashed organic grape skins are good seeds for yeast...
May 1, 2010. 8:46 PMmarnieC says:
Wow, awesome recipe, had to add a little more water but the proportion of flour to honey was spot on - i made the dough into 8 short baguettes and baked them at 185c for 25min. Also great idea with the water bath at the bottom of the oven.  
Apr 30, 2010. 2:18 PMjcksparr0w says:
you could also use water from boiled potatoes to speed up the process.

From wikipedia: The use of potatoes, water from potato boiling, eggs, or sugar in a bread dough accelerates the growth of yeasts. Salt , hot water and fats such as butter slow yeast growth[citation needed].
Jan 30, 2010. 4:38 AMiPodGuy says:
I followed this instructable and had a sourdough starter in 7 days.  Very interesting to watch the whole process.

I have one question - I tried making some biscuits, but the dough was stickier than any bread dough that I've ever used before and my biscuits didn't come out very well.  Even though I used a lot of flour, most of the dough stuck to the counter and my hands.  How can I make the dough less sticky?
Dec 1, 2008. 8:59 PMNerdz says:
AFAIK, The sour Smell caused by the bacteria, Not the Yeast.

"Actually, all doughs contain at least some bacteria. So why aren’t all breads sour? In doughs made with bakers’ yeast (the kind you buy in the store), the yeast outnumber the bacteria. Since both compete for the same sugars, the yeast win out, and the bacteria don’t have a chance to produce their acidic by-products. In sourdough, yeast and bacteria are more closely balanced, so the bacteria have a chance to add their flavors to the bread. "

http://www.exploratorium.edu/cooking/bread/recipe-sourdough.html
Nov 13, 2009. 6:13 AMaqwiz says:
 actually nerdz from what I understand the bacteria that makes it acidic is Acetobacter, look it up, it eats the alcohol (byproduct of the yeast, if the alcohol content is too high the yeast will become less active) and turns it into acetic acid, this is how vinegar is made as well, so if you were to take a tiny bit of your starter and drop it in a bottle of wine, and leave it open for a few days, you would get vinegar. 
Jul 23, 2009. 2:53 AMludovic says:
Three comments:
1. Make sure your starter doesn't go off -it can be lethal
2. Leave the starter outside to capture bacteria
3. Use organic rye flour to start the starter, it's got much more good bacteria in it

Check my blog for more details: foodings.blog.uk
Oct 22, 2009. 7:51 AMjoel.r.bradley says:
A comment to the comment,

It won't matter if the flour is organic or not. The flour is ground up starch from the inside of the seed, and not exposed to chemicals. Also no herbicide, fungicide, or pesticide would have been used on the wheat  prior to harvest. These chemicals go away with time and whould have left the plants prior to harvest.

You can use organic flour to support organic farming, but it won't make a difference when it comes to the starter.
Oct 21, 2009. 8:13 AMsameotoko says:
The thing about rye is that it has no gluten, so the dough won't be elastic at all, because it's the gluten that forms the protein coils that pull it back together. This can be a nuissance if you expect your dough to behave like dough. Also, rye can be infected by different kinds of fungus, some of which can be harmful.
Nov 4, 2009. 3:48 PMIvriniel says:
 Rye has gluten, it's just different than wheat gluten.

Nov 5, 2009. 1:19 PMsameotoko says:
yeah, you're right, sorry bout that
Oct 21, 2009. 8:18 AMsameotoko says:
Here's a brief wikipedia note on that:

http://en.wikipedia.org/wiki/Rye#Diseases

Ergot fungus are used to harvest the medication ergotamine, which is used to treat postpartum bleeding and migraine, among other diseases, because if it's vasoconstricting effects on humans. Ergotism, on the other hand, can make you loose your fingertips and earlobes.

I only bake fresh rye flour when making rye bread, I never make the starter out of it.
Dec 28, 2009. 11:11 PMRebelWithoutASauce says:
I wouldn't worry about these rye diseases, they grow on rye in the field, not in a wet acidic starter culture. I say this from experience, I have maintained an all rye culture for quite some time now and it has never been contaminated with any unpleasant bacteria. In fact, my rye starter seems almost immune to contamination.
If you ever see colorful streaks in your starter it is no good anymore. It will be pretty obvious and pretty not good tasting. To my knowledge there is no danger in having a rye starter, it is quite common practice among artisan bakers.
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Author:ItsJeremy
My current kicks are growing plants and baking bread.