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Sourdough Starter

An active sourdough starter is the key ingredient for sourdough bread and a whole host of other delicious recipes.
Prep Time 7 days
Course Bread

Equipment

  • 1 Digital scale
  • 1 Jar, about a litre in size

Ingredients
  

  • All-purpose flour
  • Water

Instructions
 

  • Day one:
    In a clean jar, mix 60 grams of flour and 60 grams of warm water. (If you prefer using measuring cups, it's 1/2 cup of loosely-packed flour and 1/4 cup of warm water.) Cover with plastic wrap or a lid and let it sit on the counter at room temperature for 24 hours.
  • Day two:
    Look at the starter to search for any signs of bubbles. You may or may not have them forming yet. Either way, leave the jar on the counter another 24 hours.
  • Day three:
    Remove and discard about half of the jar's contents. Add in 60 grams of all-purpose flour and 60 grams of warm water. Stir until smooth, cover, and let sit on the counter.
  • Day four, five, and six:
    Each day, remove and discard about half the jar's contents. Add in 60 grams of all-purpose flour and 60 grams of warm water. Stir until smooth, cover, and let sit on the counter.
    By now you should be seeing bubbles in your starter. You should also see that the starter rises in the hours after you feed it and by 24 hours later it's collapsed back down. You can wrap a rubber band around the jar at the low level to keep an eye on the rise and fall.
  • Day seven and onward:
    Your starter should be active now. The level of activeness will depend on the yeast in your starter, the temperature of the room, your local climate (such as humidity), and several other factors, most of which are beyond your control.
    Now you can go about feeding and maintaining your starter on a regular schedule. Each time you feed it, first discard half of the jar's contents, then add 60 grams flour and 60 grams warm water.
    If you're keeping your starter on your kitchen counter, you should feed it every day. However, that requires a lot of investment of flour and your time, which is fine if you're baking regularly. If you're not baking quite that frequently, you can store the starter in the fridge and feed it weekly.

Notes

Some folks, like myself, have found more success mixing flours. This might be partly due to how the flour is absorbing the water and the dryish climate here in Winnipeg affects it, or perhaps because all-purpose flour in Canada is different than in the rest of the world (so this might lead to different results than an American baking blog might experience), or it could be something else entirely. I use a 1:4 ratio of whole wheat and all-purpose flour. When adding in 60 grams of flour, this means 12 grams of whole wheat and 48 of all-purpose.
You might get weird smells. Mine commonly smells like acetone (nail polish remover) when it's left too long. You might also get a murky liquid forming on top that smells like old gym socks—this is called "hooch". Both of these are normal and have no ill effects on your starter, and the solution to both is being rigorous with your feeding until it goes away. I store my starter in the fridge since I bake about once a week and when I take it out, it reeks of acetone. I leave it on the counter for a few days, feeding it daily, and it's soon smelling fresh again and is ready to be used. However, if you don't have the few days of planning like I do, it should still be fine. I've baked a loaf with starter that had a strong acetone smell and the bread was completely fine.
Keyword sourdough bread, sourdough starter