sourdoughsourdough-starter
I have fed it first after 24h and it grew nicely. And on the 2nd morning after I woke up I saw this:
Should I keep the upper half? or simply start a new batch?
I have used the following formula: 200ml water, 200 gr 550 flour, and kept it at about 25 degree celcius.
This question involves a lot of sub-questions that don't have simple answers, so this response is a bit long.
From my experience producing dozens of starters from scratch over the years, I have to disagree with some of the details given in the other answer. There are two goals in the early days of a starter:
(1) Feeding your starter more than once per day is, in my opinion, a useful tool for guaranteeing a high success rate in the first few days of a new starter. At a minimum stirring at least a couple times per day will inhibit mold and other microorganisms from getting established on the surface before the culture becomes sour (i.e., acidic). It is true that feeding too frequently may not allow appropriate levels of sourness to occur in the first few days, but this can be overcome by two methods.
One solution is to add artificial acidity. After many, many trials, various forums online have discovered pineapple juice is a near-ideal addition to bring down pH and add acidity in the first 2-3 days of starter growth. Use it instead of water. (Note that this process can be done with feedings every 24 hours or more frequently.)
The other solution is to only add partial feedings for the first couple of days (for example, following a regimen like this one). To explain this method in more detail, rather than doubling the starter with each feeding (and discarding half), you would add the same amount each time for the first few feedings without discarding anything. Thus, the first feeding would double the quantity of starter, but the second would only add 50%, the third would add 33%, the fourth 25%. Each addition will provide fresh food to encourage yeast growth, while simultaneously concentrating the acidity.
(2) The "float test" is good for mature starters, but I don't think it's good enough to assess when your starter may be ready for bread. A very strong starter will take off and rise significantly within a few hours after feeding. I would wait until this happens.
(3) First, there is no reason to be wasteful. I have no idea why many starter recipes start with a cup of flour or whatever and waste pounds of flour in the first week. I've often started with 10-20 grams of flour. And then I follow a regimen like the second link above or something like suggested in the second page of discussion on the pineapple juice solution, where you only need a few tablespoons to get going and you don't need to discard anything for at least the first few days. Working in small quantities won't delay the establishment of your starter, and if you're only using a tablespoon or two of flour for each feeding, it's not a lot to discard.
As for ratios for feeding, as I said, many prefer a solution that actually doesn't discard anything for the first few feedings to produce adequate acidity. After you start seeing a yeast response with lots of rise (not just small bubbles which may be due to bacteria activity or the large surge in bubbles which usually happens in the first 48 hours, due to bad bacteria activity before the culture becomes sour), you can begin to discard and replenish. Many people double the culture with each feeding at this point, but I've had better results doing a 1:1:1 feeding (1 part starter to 1 part flour to 1 part water by weight) at this stage, as long as the yeast are clearly showing some activity, even if they might be slower.
Once the starter is mature, you can be more aggressive with discarding and replenishing, or alternatively planning ahead and only saving small quantities of starter for the next batch, so you don't have to discard much at all. I find the 1:1:1 feeding strikes a good balance (effectively equivalent to discarding 2/3 of the starter and replenishing the rest). Saving smaller amounts of starter will tend to produce a more mild starter, while doing your method of discarding half can lead to a somewhat more sour product, which some people prefer. Doing a 1:2:2 feeding or even using smaller quantities of starter at each feeding can also have benefits, but it requires a strong, mature starter. (For some discussion of various opinions on feeding ratios, see here. In general, the right ratio is what seems to work with your starter and to produce bread you think tastes good.)
(4) You can get away with a 24-hour period between feedings for the first few days, but as I said, I'd at least stir it every 12 hours or more frequently to avoid mold settling. The pineapple juice links above recommend against feeding more frequently in the first couple days to avoid diluting the acid. I agree with that advice if you were using water and discarding and doubling the starter with each feeding, since you wouldn't be allowing proper acid development. But if you follow the juice method or the other method outlined in the links, the acidity will become concentrated with the initial feedings, rather than diluted, and more frequent feedings can allow the yeast to "catch on" quicker.
Once established (and the 12-hour rise-and-fall cycle is a good benchmark), I would definitely recommend a 12-hour feeding cycle when sourdough cultures are kept at room temperature, unless you prefer a more sour bread result (and potentially a weaker culture). It really depends on your room temperature, your feeding proportions, and a number of other things -- sourdough can work with a lot of different conditions. I tend to use my sourdough for a variety of breads, and I rarely actually use it to make very sour "sourdough" bread, so I like to keep it very mild-flavored for adaptability reasons. Feeding every 12 hours at room temperature (or even every 8 hours in warm temperatures) will do that. When I'm not baking for a while, I put the culture in the fridge and take it out to do at least one feeding before reviving.
Again, a little thought can avoid waste. There is no reason to keep cups and cups of starter lying around, discarding half every time you feed it. When I save culture in the fridge, I generally save about 1/9th of what I actually need for my average batch of bread (which may only be a couple tablespoons: I often keep my starter in a tiny jar left over from Dijon mustard or something). Then I remove it the day before, do a 1:1:1 feeding, 12 hours later do a 1:1:1 feeding (not discarding anything, so it's now 9 times the original starter quantity), and I have a very mild and active starter ready to go. If I haven't used it in a while, I'll do a 1:2:2 feeding or even higher ratio to dilute the excess acidity that tends to build up.
To answer the final question of how long it takes to develop a reliable starter: I'd say with a 12-hour feeding schedule following a regimen like the one in the second link above, I can have a somewhat reliable starter able to bake bread in about 3 days, assuming good quality rye flour. Depending on conditions, it can sometimes take another day or two, but a couple more days of regular feeding regardless will ensure it's really strong. I've done this method over a dozen times, and I've never had a failure. Before that, using a 24-hour feeding cycle, I've had multiple failures (by which I mean mold or other things happened), and it would usually take at least a week to establish a culture. I haven't actually used the pineapple juice method (only water), so perhaps it is more reliable using a 24-hour feeding cycle in the first few days.
(Note that the reason I say I've produced dozens of starters over the years is because I've found these methods so reliable and not wasteful that I often don't even bother reviving an old starter I've neglected for months -- it's almost as easy to make a new one.)
Rye flour, I've found, is really useful, even if you eventually plan to switch to wheat for normal feedings (which you can do once you get the rise and fall in a 12-hour window). With whole-wheat flour, I've often had starters take much longer to get established.
Don't over think this.
If you know somebody who already makes sour dough, they need to refresh their culture once or twice a month. Get their "throw away" starter and use it to start yours. I bought a starter from King Arthur about 10 years ago. Still using the same starter today. King Arthur still sells sourdough starter. Their crocks work well too.
You can start a starter simply by putting out a bowl of water in the summer air. The yeast that's in the air will find its way into the water. You should then add some of that water to perhaps a half dozen jars of water flour mixture. Not every jar will start but the ones that start bubbling are worth keeping and nurturing. It may take a day or so at room temp before you see bubbles. After about two days the mixture will stop bubbling. That's when you need to add more flour/water mixture.
I use King Arthur unbleached bread flour in the light blue bag. Use 1 cup flour and one cup tap water and 1 cup starter. You can boil it if you want but I never do. Just make sure you don't add boiling water to the starter or you'll kill it. Tepid or lukewarm is fine. I don't worry about chlorine, add honey or lower the pH. If your water is unusually alkaline you may need to do something about it but first you would need to know if it's alkaline or acidic. Inexpensive pH test strips are available at pet stores that sell tropical fish, especially if they sell saltwater fish. Running your water through a carbon filter will remove the chlorine (Brita, PUR, ZeroWater). You can boil it too but then you have to wait for it to cool down. Simply leave the water in an open container and the chlorine will evaporate out...not sure how long that takes.
You'll need to repeat this a few times until you get a stable culture. Throw away one cup of starter mixture then add back one cup water and one cup flour that's been mixed together.
When you mix a fresh batch, leave it out on the counter for a few hours. It will double in size so make sure you have a big enough container. Starter over flows are a pain to clean up. From there, put your covered starter in the fridge for 2 or 3 weeks and then rebuild your starter again. I go 4 weeks maximum. Always put a date on the jar so you know when to do the refresh. Starter is like a pet, you have to take care of it and it's a long term commitment.
At 4 weeks, your starter will have a layer of black water on top. In general, don't worry about. The water will contain some alcohol as the yeast give it off as a by-product. When it's time to refresh, just pour off the layer of water. Give it a smell. It will have a sourdough smell. You'll quickly learn what that is. As far as I know I have never had a starter culture go bad. At one time I kept two cultures for white bread and one for rye. Now I just keep one culture for white bread.
When it's time to make your bread, grab 1 cup of starter for your bread and use the other cup to rebuild...one cup starter, one cup water, one cup fresh flour. Keep it simple.
You don't need added sugar for sourdough but some recipes may call for it. Authentic sourdough is much like authentic French baguettes...flour salt and water is all you really need. Baguettes use added yeast instead of the yeast in the starter. FYI, by French law, authentic French baguettes can only contain flour, salt, yeast and water, nothing else.
Over time, your starter, and your sourdough will develop their own special character/taste based on the yeast in your area.
Good luck!
Best Answer
Sourdough during the first few days can show pretty erratic behavior. I wouldn’t worry, just stir and feed as planned. Continuing the culture with just the foamy top would probably also work.
Reasons to start over would be visible mold (fluffy or colorful spots) or if there’s no bubbling. Neither is the case here.